diff --git a/apps/dsa-web/public/stocks.index.json b/apps/dsa-web/public/stocks.index.json
index 4c5ce56c4..589d92f94 100644
--- a/apps/dsa-web/public/stocks.index.json
+++ b/apps/dsa-web/public/stocks.index.json
@@ -31616,5 +31616,25 @@
 ["ZZHGF","ZZHGF","ZHONGAN ONL.P&C IN (OTC)","ZHONGAN ONL.P&C IN (OTC)","ZHONGAN ONL.P&C IN (OTC)",[],"US","stock",true,100],
 ["ZZHGY","ZZHGY","ZHONGAN ONL.P & C UNSPONSORED ADR","ZHONGAN ONL.P & C UNSPONSORED ADR","ZHONGAN ONL.P & C UNSPONSORED ADR",[],"US","stock",true,100],
 ["ZZLL","ZZLL","ZZLL INFO.TECH.","ZZLL INFO.TECH.","ZZLL INFO.TECH.",[],"US","stock",true,100],
-["ZZZOF","ZZZOF","ZINC ONE RESOURCES (OTC)","ZINC ONE RESOURCES (OTC)","ZINC ONE RESOURCES (OTC)",[],"US","stock",true,100]
+["ZZZOF","ZZZOF","ZINC ONE RESOURCES (OTC)","ZINC ONE RESOURCES (OTC)","ZINC ONE RESOURCES (OTC)",[],"US","stock",true,100],
+["000660.KS","000660.KS","SK海力士","SKhailishi","SKhls",["SK Hynix","海力士","하이닉스"],"KR","stock",true,100],
+["005380.KS","005380.KS","现代汽车","xiandaiqiche","xdqc",["Hyundai","Hyundai Motor","现代","현대차"],"KR","stock",true,100],
+["005930.KS","005930.KS","三星电子","sanxingdianzi","sxdz",["Samsung","Samsung Electronics","三星","삼성전자"],"KR","stock",true,100],
+["006400.KS","006400.KS","三星SDI","sanxingSDI","sxSDI",["Samsung SDI"],"KR","stock",true,100],
+["035420.KS","035420.KS","NAVER","AVER","AVER",["Naver","네이버"],"KR","stock",true,100],
+["035720.KQ","035720.KQ","Kakao","Kakao","Kakao",["可可","카카오"],"KR","stock",true,100],
+["051910.KS","051910.KS","LG化学","LGhuaxue","LGhx",["LG Chem"],"KR","stock",true,100],
+["091990.KQ","091990.KQ","赛尔群医疗","saierqunyiliao","seqyl",["Celltrion Healthcare","Celltrion","셀트리온헬스케어"],"KR","stock",true,100],
+["247540.KQ","247540.KQ","Ecopro BM","Ecopro BM","Ecopro BM",["ECOPRO BM","에코프로비엠"],"KR","stock",true,100],
+["373220.KS","373220.KS","LG新能源","LGxinnengyuan","LGxny",["LG Energy Solution","LGES"],"KR","stock",true,100],
+["6501.T","6501.T","日立","rili","rl",["Hitachi","日立制作所","日立製作所"],"JP","stock",true,100],
+["6758.T","6758.T","索尼集团","suonijituan","snjt",["Sony","Sony Group","索尼","ソニー"],"JP","stock",true,100],
+["6861.T","6861.T","基恩士","jienshi","jes",["Keyence","キーエンス"],"JP","stock",true,100],
+["7203.T","7203.T","丰田汽车","fengtianqiche","ftqc",["Toyota","Toyota Motor","丰田","トヨタ"],"JP","stock",true,100],
+["7974.T","7974.T","任天堂","rentiantang","rtt",["Nintendo"],"JP","stock",true,100],
+["8035.T","8035.T","东京电子","dongjingdianzi","djdz",["Tokyo Electron","東京エレクトロン"],"JP","stock",true,100],
+["8306.T","8306.T","三菱日联金融集团","sanlingrilianjinrongjituan","slrljrjt",["MUFG","Mitsubishi UFJ","三菱日联","三菱UFJ"],"JP","stock",true,100],
+["9432.T","9432.T","日本电信电话","ribendianxindianhua","rbdxdh",["NTT","Nippon Telegraph and Telephone"],"JP","stock",true,100],
+["9983.T","9983.T","迅销","xunxiao","xx",["Fast Retailing","Uniqlo","优衣库"],"JP","stock",true,100],
+["9984.T","9984.T","软银集团","ruanyinjituan","ryjt",["SoftBank","SoftBank Group","软银","ソフトバンク"],"JP","stock",true,100]
 ]
diff --git a/apps/dsa-web/src/types/stockIndex.ts b/apps/dsa-web/src/types/stockIndex.ts
index f978dbe56..9ab915e72 100644
--- a/apps/dsa-web/src/types/stockIndex.ts
+++ b/apps/dsa-web/src/types/stockIndex.ts
@@ -4,7 +4,7 @@
  * Stock data index for autocomplete functionality
  */
 
-export type Market = 'CN' | 'HK' | 'US' | 'INDEX' | 'ETF' | 'BSE';
+export type Market = 'CN' | 'HK' | 'US' | 'JP' | 'KR' | 'INDEX' | 'ETF' | 'BSE';
 export type AssetType = 'stock' | 'index' | 'etf';
 
 /**
diff --git a/apps/dsa-web/src/utils/__tests__/searchStocks.test.ts b/apps/dsa-web/src/utils/__tests__/searchStocks.test.ts
index b7f31dfd7..7883b5779 100644
--- a/apps/dsa-web/src/utils/__tests__/searchStocks.test.ts
+++ b/apps/dsa-web/src/utils/__tests__/searchStocks.test.ts
@@ -67,6 +67,42 @@ const mockIndex: StockIndexItem[] = [
     active: true,
     popularity: 98,
   },
+  {
+    canonicalCode: "7203.T",
+    displayCode: "7203.T",
+    nameZh: "丰田汽车",
+    pinyinFull: "fengtianqiche",
+    pinyinAbbr: "ftqc",
+    aliases: ["Toyota", "Toyota Motor", "丰田"],
+    market: "JP",
+    assetType: "stock",
+    active: true,
+    popularity: 97,
+  },
+  {
+    canonicalCode: "005930.KS",
+    displayCode: "005930.KS",
+    nameZh: "三星电子",
+    pinyinFull: "sanxingdianzi",
+    pinyinAbbr: "sxdz",
+    aliases: ["Samsung", "Samsung Electronics", "三星"],
+    market: "KR",
+    assetType: "stock",
+    active: true,
+    popularity: 97,
+  },
+  {
+    canonicalCode: "035720.KQ",
+    displayCode: "035720.KQ",
+    nameZh: "Kakao",
+    pinyinFull: "Kakao",
+    pinyinAbbr: "Kakao",
+    aliases: ["Kakao", "可可"],
+    market: "KR",
+    assetType: "stock",
+    active: true,
+    popularity: 92,
+  },
   {
     canonicalCode: "600000.SH",
     displayCode: "600000",
@@ -213,6 +249,40 @@ describe('searchStocks', () => {
     expect(results[0].market).toBe('HK');
   });
 
+  test('日股 Yahoo 后缀代码匹配', () => {
+    const results = searchStocks('7203.T', mockIndex);
+    expect(results).toHaveLength(1);
+    expect(results[0].canonicalCode).toBe('7203.T');
+    expect(results[0].market).toBe('JP');
+  });
+
+  test('日股英文别名匹配', () => {
+    const results = searchStocks('Toyota', mockIndex);
+    expect(results).toHaveLength(1);
+    expect(results[0].canonicalCode).toBe('7203.T');
+    expect(results[0].matchField).toBe('alias');
+  });
+
+  test('韩股 KOSPI Yahoo 后缀代码匹配', () => {
+    const results = searchStocks('005930.KS', mockIndex);
+    expect(results).toHaveLength(1);
+    expect(results[0].canonicalCode).toBe('005930.KS');
+    expect(results[0].market).toBe('KR');
+  });
+
+  test('韩股 KOSDAQ Yahoo 后缀代码匹配', () => {
+    const results = searchStocks('035720.KQ', mockIndex);
+    expect(results).toHaveLength(1);
+    expect(results[0].canonicalCode).toBe('035720.KQ');
+    expect(results[0].market).toBe('KR');
+  });
+
+  test('韩股中文别名匹配', () => {
+    const results = searchStocks('三星', mockIndex);
+    expect(results).toHaveLength(1);
+    expect(results[0].canonicalCode).toBe('005930.KS');
+  });
+
   describe('Edge case tests', () => {
     test('special character query', () => {
       const results = searchStocks('@#$%', mockIndex);
diff --git a/apps/dsa-web/src/utils/__tests__/validation.test.ts b/apps/dsa-web/src/utils/__tests__/validation.test.ts
new file mode 100644
index 000000000..f6034a928
--- /dev/null
+++ b/apps/dsa-web/src/utils/__tests__/validation.test.ts
@@ -0,0 +1,30 @@
+import { describe, expect, test } from 'vitest';
+import {
+  isObviouslyInvalidStockQuery,
+  looksLikeStockCode,
+  validateStockCode,
+} from '../validation';
+
+describe('stock code validation', () => {
+  test.each([
+    ['7203.T', '7203.T'],
+    ['6758.t', '6758.T'],
+    ['005930.KS', '005930.KS'],
+    ['035720.kq', '035720.KQ'],
+  ])('accepts JP/KR Yahoo suffix code %s', (input, normalized) => {
+    expect(looksLikeStockCode(input)).toBe(true);
+    expect(validateStockCode(input)).toEqual({
+      valid: true,
+      normalized,
+    });
+    expect(isObviouslyInvalidStockQuery(input)).toBe(false);
+  });
+
+  test.each(['7203', '005930.K', '035720.KRX'])(
+    'does not treat ambiguous JP/KR-like query %s as a valid suffix code',
+    (input) => {
+      const result = validateStockCode(input);
+      expect(result.valid).toBe(false);
+    }
+  );
+});
diff --git a/apps/dsa-web/src/utils/validation.ts b/apps/dsa-web/src/utils/validation.ts
index fb2a268d2..cc94ea310 100644
--- a/apps/dsa-web/src/utils/validation.ts
+++ b/apps/dsa-web/src/utils/validation.ts
@@ -13,6 +13,8 @@ const STOCK_CODE_PATTERNS = [
   /^\d{5}$/, // HK code without prefix
   /^HK\d{1,5}$/, // HK-prefixed code, for example HK00700
   /^\d{1,5}\.HK$/, // HK suffix format, for example 00700.HK
+  /^\d{4,5}\.T$/, // Japan Yahoo suffix format, for example 7203.T
+  /^\d{6}\.(KS|KQ)$/, // Korea Yahoo suffix format, for example 005930.KS or 035720.KQ
   /^[A-Z]{1,5}(?:\.(?:US|[A-Z]))?$/, // Common US ticker format
 ];
 
@@ -25,7 +27,7 @@ export const looksLikeStockCode = (value: string): boolean => {
 };
 
 /**
- * Validate common A-share, HK, and US stock code formats.
+ * Validate common A-share, HK, US, JP, and KR stock code formats.
  */
 export const validateStockCode = (value: string): ValidationResult => {
   const normalized = value.trim().toUpperCase();
diff --git a/docs/CHANGELOG.md b/docs/CHANGELOG.md
index cd95802fb..dc232a1d9 100644
--- a/docs/CHANGELOG.md
+++ b/docs/CHANGELOG.md
@@ -56,6 +56,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/).
 - [新功能] 个股分析历史成功保存后会从最终报告 best-effort 提取 `DecisionSignal` 决策信号，复用现有信号去重、计划质量计算和脱敏契约。
 - [修复] AlphaSift 热点详情兼容 `leader_stocks` 与 `stocks` 双字段，避免旧合约或缓存只提供其中一个字段时概念股详情报缺失字段。
 - [改进] 问股页移动端策略选择改为默认收起的按钮入口，展开后仍可多选策略并在发送后自动收起，减少对对话内容的遮挡。
+- [修复] #1718 Web 股票输入与自动补全补齐日韩 Yahoo 后缀代码校验和常用日韩股票索引，手输或搜索 `7203.T`、`005930.KS`、`035720.KQ` 可正常提交分析。
 
 
 ## [3.22.0] - 2026-06-13
diff --git a/docs/market-support.md b/docs/market-support.md
index 968a3917a..19128ed42 100644
--- a/docs/market-support.md
+++ b/docs/market-support.md
@@ -2,7 +2,7 @@
 
 ## 日本/韩国个股 suffix-only MVP（Issue #1718）
 
-当前阶段支持手动输入日本、韩国股票的 Yahoo Finance 后缀代码，进入既有个股分析、历史保存和基础报告展示链路。
+当前阶段支持手动输入日本、韩国股票的 Yahoo Finance 后缀代码，进入既有个股分析、历史保存和基础报告展示链路。Web 自动补全内置一批常用日股/韩股种子索引，支持按 suffix 代码、中英文名称或常用别名搜索。
 
 支持格式：
 
@@ -22,10 +22,10 @@
 
 - 不承诺实时行情；Yahoo Finance 数据可能延迟或字段缺失。
 - 不承诺完整基本面、行业/板块、市场宽度、涨跌家数或日韩大盘复盘。
-- 不包含日韩股票列表自动补全；没有索引前仅支持手动输入 suffix 代码。
+- 不承诺完整日韩全市场股票列表；Web 自动补全当前仅覆盖仓内种子索引中的常用标的，未命中时仍可手动输入 suffix 代码。
 - 不补齐 Portfolio 的 JPY/KRW 汇率、成本、市值完整口径；相关字段仅放开市场类型以避免前后端校验拒绝。
 
-回滚方式：移除 `jp/kr` 市场识别、交易日历注册、YFinance 路由扩展和 Web/API 类型放行，并删除本文档中的能力声明。
+回滚方式：移除 `jp/kr` 市场识别、交易日历注册、YFinance 路由扩展、Web/API 类型放行、`scripts/stock_index_seeds/` 日韩种子索引，并删除本文档中的能力声明。
 
 配置兼容性：
 
diff --git a/scripts/generate_index_from_csv.py b/scripts/generate_index_from_csv.py
index 473b4b8ce..809b57918 100644
--- a/scripts/generate_index_from_csv.py
+++ b/scripts/generate_index_from_csv.py
@@ -5,6 +5,7 @@ Generate Stock Index from CSV File
 
 Input:
   - Tushare format: data/stock_list_{a,hk,us}.csv
+  - Seed format: scripts/stock_index_seeds/stock_list_{jp,kr}.csv
   - AkShare format: logs/stock_basic_*.csv
 
 Output: apps/dsa-web/public/stocks.index.json
@@ -84,7 +85,7 @@ def load_csv_data(csv_path: Path) -> List[Dict[str, Any]]:
 
 def load_tushare_data(data_dir: Path) -> List[Dict[str, Any]]:
     """
-    从 Tushare CSV 文件加载三个市场的股票数据
+    从 Tushare CSV 文件加载多市场股票数据
 
     Args:
         data_dir: 数据目录路径
@@ -93,10 +94,22 @@ def load_tushare_data(data_dir: Path) -> List[Dict[str, Any]]:
         合并后的股票列表
     """
     all_stocks = []
+    seed_dir = Path(__file__).parent / 'stock_index_seeds'
+    default_data_dir = Path(__file__).parent.parent / 'data'
+    use_seed_fallback = data_dir.resolve() == default_data_dir.resolve()
+
+    def _csv_path(file_name: str) -> Path:
+        data_path = data_dir / file_name
+        if data_path.exists() or not use_seed_fallback:
+            return data_path
+        return seed_dir / file_name
+
     market_files = {
         'CN': data_dir / 'stock_list_a.csv',
         'HK': data_dir / 'stock_list_hk.csv',
         'US': data_dir / 'stock_list_us.csv',
+        'JP': _csv_path('stock_list_jp.csv'),
+        'KR': _csv_path('stock_list_kr.csv'),
     }
 
     for market_name, csv_file in market_files.items():
@@ -290,6 +303,7 @@ def extract_symbol_from_ts_code(ts_code: str, market: str) -> Optional[str]:
     - A股：000001.SZ → 000001
     - 港股：00700.HK → 00700
     - 美股：AAPL → AAPL
+    - 日股/韩股：7203.T / 005930.KS → 保留后缀，避免与其他市场裸代码冲突
 
     Args:
         ts_code: TS代码
@@ -301,8 +315,8 @@ def extract_symbol_from_ts_code(ts_code: str, market: str) -> Optional[str]:
     if not ts_code:
         return None
 
-    if market == 'US':
-        # 美股无后缀，直接返回
+    if market in {'US', 'JP', 'KR'}:
+        # 美股常见 class/share 后缀、日韩 Yahoo 后缀都是代码身份的一部分。
         return ts_code
 
     if '.' in ts_code:
@@ -316,7 +330,7 @@ def get_stock_name(row: Dict[str, str], market: str) -> Optional[str]:
     """
     获取股票名称
 
-    - A股/港股：使用 name 字段
+    - A股/港股/日股/韩股：使用 name 字段
     - 美股：使用 enname 字段（英文名称）
 
     Args:
@@ -337,6 +351,20 @@ def get_stock_name(row: Dict[str, str], market: str) -> Optional[str]:
         return name if name else None
 
 
+def parse_aliases(row: Dict[str, str]) -> List[str]:
+    """Parse optional seed aliases from a CSV row."""
+    raw_aliases = (row.get('aliases') or row.get('alias') or '').strip()
+    if not raw_aliases:
+        return []
+
+    aliases: List[str] = []
+    for alias in re.split(r'[|;,，、]+', raw_aliases):
+        normalized = unicodedata.normalize('NFKC', alias).strip()
+        if normalized and normalized not in aliases:
+            aliases.append(normalized)
+    return aliases
+
+
 def parse_stock_row(row: Dict[str, str], preferred_market: Optional[str] = None) -> Optional[Dict[str, Any]]:
     """
     解析单行股票数据
@@ -387,6 +415,7 @@ def parse_stock_row(row: Dict[str, str], preferred_market: Optional[str] = None)
         'symbol': display_code,
         'name': name,
         'market': market,
+        'aliases': parse_aliases(row),
     }
 
 
@@ -395,10 +424,10 @@ def determine_market(ts_code: str) -> str:
     Determine market based on code
 
     Args:
-        ts_code: Trading code (e.g., 000001.SZ, AAPL, BRK.B, GOOG.A)
+        ts_code: Trading code (e.g., 000001.SZ, AAPL, BRK.B, 7203.T, 005930.KS)
 
     Returns:
-        Market code (CN, HK, US, BSE)
+        Market code (CN, HK, US, BSE, JP, KR)
     """
     if '.' in ts_code:
         # 有后缀的情况
@@ -410,6 +439,10 @@ def determine_market(ts_code: str) -> str:
             return 'HK'
         elif suffix == 'BJ':
             return 'BSE'
+        elif suffix == 'T':
+            return 'JP'
+        elif suffix in ['KS', 'KQ']:
+            return 'KR'
         # 有后缀但不是中国市场后缀，检查是否为美股
         # 美股可能有点号后缀（如 BRK.B, GOOG.A, AAPL.U）
         prefix = ts_code.split('.')[0]
@@ -536,6 +569,9 @@ def build_stock_index(stocks: List[Dict[str, Any]]) -> List[Dict[str, Any]]:
 
         # Generate aliases.
         aliases = generate_aliases(name, market)
+        for alias in stock.get('aliases', []):
+            if alias != name and alias not in aliases:
+                aliases.append(alias)
 
         index.append({
             "canonicalCode": ts_code,    # Example: 000001.SZ, AAPL
diff --git a/scripts/refresh_stock_index.py b/scripts/refresh_stock_index.py
index 779253347..33efdfd04 100644
--- a/scripts/refresh_stock_index.py
+++ b/scripts/refresh_stock_index.py
@@ -4,7 +4,7 @@
 
 Default flow:
 1. Fetch Tushare stock lists into ``data/`` with ``--a-rk`` for A-share name correction.
-2. Generate ``apps/dsa-web/public/stocks.index.json`` from CSV.
+2. Generate ``apps/dsa-web/public/stocks.index.json`` from CSV plus JP/KR seed rows.
 3. Copy the generated index to ``static/stocks.index.json`` for backend use.
 """
 
diff --git a/scripts/stock_index_seeds/stock_list_jp.csv b/scripts/stock_index_seeds/stock_list_jp.csv
new file mode 100644
index 000000000..cfd228838
--- /dev/null
+++ b/scripts/stock_index_seeds/stock_list_jp.csv
@@ -0,0 +1,11 @@
+ts_code,symbol,name,enname,aliases
+7203.T,7203.T,丰田汽车,Toyota Motor Corporation,Toyota|Toyota Motor|丰田|トヨタ
+6758.T,6758.T,索尼集团,Sony Group Corporation,Sony|Sony Group|索尼|ソニー
+9984.T,9984.T,软银集团,SoftBank Group Corp.,SoftBank|SoftBank Group|软银|ソフトバンク
+8306.T,8306.T,三菱日联金融集团,Mitsubishi UFJ Financial Group,MUFG|Mitsubishi UFJ|三菱日联|三菱UFJ
+6861.T,6861.T,基恩士,Keyence Corporation,Keyence|キーエンス
+6501.T,6501.T,日立,Hitachi Ltd.,Hitachi|日立制作所|日立製作所
+7974.T,7974.T,任天堂,Nintendo Co. Ltd.,Nintendo|任天堂
+8035.T,8035.T,东京电子,Tokyo Electron Limited,Tokyo Electron|東京エレクトロン
+9432.T,9432.T,日本电信电话,Nippon Telegraph and Telephone Corporation,NTT|Nippon Telegraph and Telephone|日本电信电话
+9983.T,9983.T,迅销,Fast Retailing Co. Ltd.,Fast Retailing|Uniqlo|优衣库|迅销
diff --git a/scripts/stock_index_seeds/stock_list_kr.csv b/scripts/stock_index_seeds/stock_list_kr.csv
new file mode 100644
index 000000000..3dc81bfcf
--- /dev/null
+++ b/scripts/stock_index_seeds/stock_list_kr.csv
@@ -0,0 +1,11 @@
+ts_code,symbol,name,enname,aliases
+005930.KS,005930.KS,三星电子,Samsung Electronics Co. Ltd.,Samsung|Samsung Electronics|三星|삼성전자
+000660.KS,000660.KS,SK海力士,SK hynix Inc.,SK Hynix|海力士|하이닉스
+373220.KS,373220.KS,LG新能源,LG Energy Solution Ltd.,LG Energy Solution|LGES|LG新能源
+005380.KS,005380.KS,现代汽车,Hyundai Motor Company,Hyundai|Hyundai Motor|现代|현대차
+035420.KS,035420.KS,NAVER,NAVER Corporation,Naver|NAVER|네이버
+051910.KS,051910.KS,LG化学,LG Chem Ltd.,LG Chem|LG化学
+006400.KS,006400.KS,三星SDI,Samsung SDI Co. Ltd.,Samsung SDI|三星SDI
+035720.KQ,035720.KQ,Kakao,Kakao Corp.,Kakao|可可|카카오
+247540.KQ,247540.KQ,Ecopro BM,Ecopro BM Co. Ltd.,Ecopro BM|ECOPRO BM|에코프로비엠
+091990.KQ,091990.KQ,赛尔群医疗,Celltrion Healthcare Co. Ltd.,Celltrion Healthcare|Celltrion|셀트리온헬스케어
diff --git a/tests/test_generate_index_from_csv.py b/tests/test_generate_index_from_csv.py
index 97802346f..0d2e9cf12 100644
--- a/tests/test_generate_index_from_csv.py
+++ b/tests/test_generate_index_from_csv.py
@@ -55,6 +55,16 @@ class TestExtractSymbol:
         result = extract_symbol_from_ts_code("AAPL", "US")
         assert result == "AAPL"
 
+    def test_jp_stock_preserves_suffix(self):
+        """测试日股保留 Yahoo 后缀以避免裸代码冲突"""
+        result = extract_symbol_from_ts_code("7203.T", "JP")
+        assert result == "7203.T"
+
+    def test_kr_stock_preserves_suffix(self):
+        """测试韩股保留 Yahoo 后缀以避免裸代码冲突"""
+        result = extract_symbol_from_ts_code("005930.KS", "KR")
+        assert result == "005930.KS"
+
     def test_empty_ts_code(self):
         """测试空 ts_code"""
         result = extract_symbol_from_ts_code("", "CN")
@@ -114,6 +124,21 @@ class TestDetermineMarket:
         result = determine_market("AAPL.U")
         assert result == "US"
 
+    def test_jp_stock_with_yahoo_suffix(self):
+        """测试日股 Yahoo 后缀"""
+        result = determine_market("7203.T")
+        assert result == "JP"
+
+    def test_kr_kospi_stock_with_yahoo_suffix(self):
+        """测试韩股 KOSPI Yahoo 后缀"""
+        result = determine_market("005930.KS")
+        assert result == "KR"
+
+    def test_kr_kosdaq_stock_with_yahoo_suffix(self):
+        """测试韩股 KOSDAQ Yahoo 后缀"""
+        result = determine_market("035720.KQ")
+        assert result == "KR"
+
 
 class TestGetStockName:
     """测试股票名称获取函数"""
@@ -214,6 +239,38 @@ class TestDataCleaning:
         assert result['name'] == "BERKSHIRE HATHAWAY 'B'"
         assert result['market'] == 'US'
 
+    def test_valid_jp_stock_with_seed_aliases(self):
+        """测试有效的日股种子记录"""
+        row = {
+            'ts_code': '7203.T',
+            'name': '丰田汽车',
+            'enname': 'Toyota Motor Corporation',
+            'aliases': 'Toyota|Toyota Motor|丰田'
+        }
+        result = parse_stock_row(row, 'JP')
+        assert result is not None
+        assert result['ts_code'] == '7203.T'
+        assert result['symbol'] == '7203.T'
+        assert result['name'] == '丰田汽车'
+        assert result['market'] == 'JP'
+        assert result['aliases'] == ['Toyota', 'Toyota Motor', '丰田']
+
+    def test_valid_kr_stock_with_seed_aliases(self):
+        """测试有效的韩股种子记录"""
+        row = {
+            'ts_code': '005930.KS',
+            'name': '三星电子',
+            'enname': 'Samsung Electronics',
+            'aliases': 'Samsung|Samsung Electronics|三星'
+        }
+        result = parse_stock_row(row, 'KR')
+        assert result is not None
+        assert result['ts_code'] == '005930.KS'
+        assert result['symbol'] == '005930.KS'
+        assert result['name'] == '三星电子'
+        assert result['market'] == 'KR'
+        assert result['aliases'] == ['Samsung', 'Samsung Electronics', '三星']
+
     def test_us_dummy_filtered(self):
         """测试美股 DUMMY 记录被过滤"""
         row = {
@@ -430,23 +487,47 @@ class TestIntegration:
                 'enname': 'Apple Inc.'
             })
 
+        jp_csv = tmp_path / 'stock_list_jp.csv'
+        with open(jp_csv, 'w', encoding='utf-8-sig', newline='') as f:
+            writer = csv.DictWriter(f, fieldnames=['ts_code', 'name', 'enname', 'aliases'])
+            writer.writeheader()
+            writer.writerow({
+                'ts_code': '7203.T',
+                'name': '丰田汽车',
+                'enname': 'Toyota Motor Corporation',
+                'aliases': 'Toyota|丰田'
+            })
+
+        kr_csv = tmp_path / 'stock_list_kr.csv'
+        with open(kr_csv, 'w', encoding='utf-8-sig', newline='') as f:
+            writer = csv.DictWriter(f, fieldnames=['ts_code', 'name', 'enname', 'aliases'])
+            writer.writeheader()
+            writer.writerow({
+                'ts_code': '005930.KS',
+                'name': '三星电子',
+                'enname': 'Samsung Electronics',
+                'aliases': 'Samsung|三星'
+            })
+
         # 加载数据
         stocks = load_tushare_data(tmp_path)
 
         # 验证数据
-        assert len(stocks) == 3
+        assert len(stocks) == 5
 
         # 构建索引
         index = build_stock_index(stocks)
 
         # 验证索引
-        assert len(index) == 3
+        assert len(index) == 5
+        assert next(item for item in index if item['canonicalCode'] == '7203.T')['aliases'] == ['Toyota', '丰田']
+        assert next(item for item in index if item['canonicalCode'] == '005930.KS')['aliases'] == ['Samsung', '三星']
 
         # 压缩索引
         compressed = compress_index(index)
 
         # 验证压缩
-        assert len(compressed) == 3
+        assert len(compressed) == 5
 
         # 验证字段数量
         for item in compressed: