diff --git a/AssetManager.Data/DatabaseService.cs b/AssetManager.Data/DatabaseService.cs
index 0c45506..c88a531 100644
--- a/AssetManager.Data/DatabaseService.cs
+++ b/AssetManager.Data/DatabaseService.cs
@@ -19,7 +19,9 @@ public class DatabaseService
             typeof(Portfolio),
             typeof(Position),
             typeof(Transaction),
-            typeof(TiingoTicker)
+            typeof(TiingoTicker),
+            typeof(MarketPriceCache),
+            typeof(MarketKlineCache)
         );
     }
 
diff --git a/AssetManager.Data/MarketKlineCache.cs b/AssetManager.Data/MarketKlineCache.cs
new file mode 100644
index 0000000..cd75e72
--- /dev/null
+++ b/AssetManager.Data/MarketKlineCache.cs
@@ -0,0 +1,82 @@
+using SqlSugar;
+
+namespace AssetManager.Data;
+
+/// <summary>
+/// 历史K线缓存表（永久存储）
+/// </summary>
+[SugarTable("market_kline_cache")]
+public class MarketKlineCache
+{
+    /// <summary>
+    /// 主键：md5(symbol + asset_type + timeframe + timestamp)
+    /// </summary>
+    [SugarColumn(IsPrimaryKey = true, Length = 64)]
+    public string Id { get; set; } = string.Empty;
+
+    /// <summary>
+    /// 标的代码（如 AAPL、BTC-USDT）
+    /// </summary>
+    [SugarColumn(Length = 32, IsNullable = false)]
+    public string Symbol { get; set; } = string.Empty;
+
+    /// <summary>
+    /// 资产类型：Stock/Crypto
+    /// </summary>
+    [SugarColumn(Length = 16, IsNullable = false, DefaultValue = "Stock")]
+    public string AssetType { get; set; } = "Stock";
+
+    /// <summary>
+    /// 时间周期：1min/5min/1h/1d/1w等
+    /// </summary>
+    [SugarColumn(Length = 16, IsNullable = false)]
+    public string Timeframe { get; set; } = string.Empty;
+
+    /// <summary>
+    /// K线时间
+    /// </summary>
+    [SugarColumn(IsNullable = false)]
+    public DateTime Timestamp { get; set; }
+
+    /// <summary>
+    /// 开盘价
+    /// </summary>
+    [SugarColumn(DecimalDigits = 8, IsNullable = false)]
+    public decimal Open { get; set; }
+
+    /// <summary>
+    /// 最高价
+    /// </summary>
+    [SugarColumn(DecimalDigits = 8, IsNullable = false)]
+    public decimal High { get; set; }
+
+    /// <summary>
+    /// 最低价
+    /// </summary>
+    [SugarColumn(DecimalDigits = 8, IsNullable = false)]
+    public decimal Low { get; set; }
+
+    /// <summary>
+    /// 收盘价
+    /// </summary>
+    [SugarColumn(DecimalDigits = 8, IsNullable = false)]
+    public decimal Close { get; set; }
+
+    /// <summary>
+    /// 成交量
+    /// </summary>
+    [SugarColumn(DecimalDigits = 8, IsNullable = true)]
+    public decimal? Volume { get; set; }
+
+    /// <summary>
+    /// 数据源：Tiingo/OKX/Mock
+    /// </summary>
+    [SugarColumn(Length = 32, IsNullable = false)]
+    public string Source { get; set; } = string.Empty;
+
+    /// <summary>
+    /// 获取时间
+    /// </summary>
+    [SugarColumn(IsNullable = false)]
+    public DateTime FetchedAt { get; set; }
+}
diff --git a/AssetManager.Data/MarketPriceCache.cs b/AssetManager.Data/MarketPriceCache.cs
new file mode 100644
index 0000000..a264d99
--- /dev/null
+++ b/AssetManager.Data/MarketPriceCache.cs
@@ -0,0 +1,58 @@
+using SqlSugar;
+
+namespace AssetManager.Data;
+
+/// <summary>
+/// 实时价格缓存表
+/// </summary>
+[SugarTable("market_price_cache")]
+public class MarketPriceCache
+{
+    /// <summary>
+    /// 主键：md5(symbol + asset_type)
+    /// </summary>
+    [SugarColumn(IsPrimaryKey = true, Length = 32)]
+    public string Id { get; set; } = string.Empty;
+
+    /// <summary>
+    /// 标的代码（如 AAPL、BTC-USDT）
+    /// </summary>
+    [SugarColumn(Length = 32, IsNullable = false)]
+    public string Symbol { get; set; } = string.Empty;
+
+    /// <summary>
+    /// 资产类型：Stock/Crypto
+    /// </summary>
+    [SugarColumn(Length = 16, IsNullable = false, DefaultValue = "Stock")]
+    public string AssetType { get; set; } = "Stock";
+
+    /// <summary>
+    /// 最新价格
+    /// </summary>
+    [SugarColumn(DecimalDigits = 8, IsNullable = false)]
+    public decimal Price { get; set; }
+
+    /// <summary>
+    /// 前收盘价（计算当日涨跌幅用）
+    /// </summary>
+    [SugarColumn(DecimalDigits = 8, IsNullable = true)]
+    public decimal? PreviousClose { get; set; }
+
+    /// <summary>
+    /// 数据源：Tiingo/OKX/Mock
+    /// </summary>
+    [SugarColumn(Length = 32, IsNullable = false)]
+    public string Source { get; set; } = string.Empty;
+
+    /// <summary>
+    /// 数据获取时间
+    /// </summary>
+    [SugarColumn(IsNullable = false)]
+    public DateTime FetchedAt { get; set; }
+
+    /// <summary>
+    /// 过期时间
+    /// </summary>
+    [SugarColumn(IsNullable = false)]
+    public DateTime ExpiredAt { get; set; }
+}
diff --git a/AssetManager.Infrastructure/Services/MarketDataService.cs b/AssetManager.Infrastructure/Services/MarketDataService.cs
index fd11dc4..0311547 100644
--- a/AssetManager.Infrastructure/Services/MarketDataService.cs
+++ b/AssetManager.Infrastructure/Services/MarketDataService.cs
@@ -1,5 +1,7 @@
 using System.Net.Http.Json;
-using System.Text.Json;
+using System.Security.Cryptography;
+using System.Text;
+using AssetManager.Data;
 using AssetManager.Models.DTOs;
 using Microsoft.Extensions.Logging;
 
@@ -12,6 +14,7 @@ public class MarketDataService : IMarketDataService
 {
     private readonly ILogger<MarketDataService> _logger;
     private readonly HttpClient _httpClient;
+    private readonly DatabaseService _databaseService;
     private readonly string _tiingoApiKey;
 
     /// <summary>
@@ -19,10 +22,15 @@ public class MarketDataService : IMarketDataService
     /// </summary>
     /// <param name="logger">日志记录器</param>
     /// <param name="httpClientFactory">HTTP 客户端工厂</param>
-    public MarketDataService(ILogger<MarketDataService> logger, IHttpClientFactory httpClientFactory)
+    /// <param name="databaseService">数据库服务</param>
+    public MarketDataService(
+        ILogger<MarketDataService> logger, 
+        IHttpClientFactory httpClientFactory,
+        DatabaseService databaseService)
     {
         _logger = logger;
         _httpClient = httpClientFactory.CreateClient();
+        _databaseService = databaseService;
         // 完全从环境变量读取 Tiingo API Key
         _tiingoApiKey = Environment.GetEnvironmentVariable("Tiingo__ApiKey")
             ?? Environment.GetEnvironmentVariable("TIINGO_API_KEY")
@@ -246,15 +254,59 @@ public class MarketDataService : IMarketDataService
     {
         _logger.LogInformation("获取实时价格: {Symbol}, 资产类型: {AssetType}", symbol, assetType);
         
+        var db = _databaseService.GetDb();
+        var cacheKey = GenerateMd5Hash($"{symbol.ToUpper()}_{assetType.ToUpper()}");
+        
+        // 先查缓存
+        var cached = await db.Queryable<MarketPriceCache>()
+            .FirstAsync(p => p.Id == cacheKey && p.ExpiredAt > DateTime.Now);
+        
+        if (cached != null)
+        {
+            _logger.LogDebug("缓存命中: {Symbol} {AssetType}, 价格: {Price}", symbol, assetType, cached.Price);
+            return new MarketPriceResponse
+            {
+                Symbol = cached.Symbol,
+                Price = cached.Price,
+                PreviousClose = cached.PreviousClose ?? 0,
+                Timestamp = cached.FetchedAt,
+                AssetType = cached.AssetType
+            };
+        }
+
+        // 缓存未命中，调用API
+        MarketPriceResponse response;
+        string source;
         if (assetType.Equals("Crypto", StringComparison.OrdinalIgnoreCase))
         {
-            return await GetCryptoPriceAsync(symbol);
+            response = await GetCryptoPriceAsync(symbol);
+            source = "OKX";
         }
         else
         {
             // 默认走股票数据源
-            return await GetStockPriceAsync(symbol);
+            response = await GetStockPriceAsync(symbol);
+            source = "Tiingo";
         }
+
+        // 写入缓存
+        var cacheEntity = new MarketPriceCache
+        {
+            Id = cacheKey,
+            Symbol = symbol.ToUpper(),
+            AssetType = assetType.ToUpper(),
+            Price = response.Price,
+            PreviousClose = response.PreviousClose,
+            Source = source,
+            FetchedAt = DateTime.Now,
+            ExpiredAt = GetCacheExpirationTime(assetType)
+        };
+
+        // 存在则更新，不存在则插入
+        await db.Storageable(cacheEntity).ExecuteCommandAsync();
+        
+        _logger.LogDebug("缓存写入: {Symbol} {AssetType}, 过期时间: {ExpiredAt}", symbol, assetType, cacheEntity.ExpiredAt);
+        return response;
     }
 
     /// <summary>
@@ -265,15 +317,76 @@ public class MarketDataService : IMarketDataService
         _logger.LogInformation("获取历史数据: {Symbol}, 资产类型: {AssetType}, 周期: {Timeframe}, 数量: {Limit}", 
             symbol, assetType, timeframe, limit);
         
+        var db = _databaseService.GetDb();
+        var symbolUpper = symbol.ToUpper();
+        var assetTypeUpper = assetType.ToUpper();
+        var timeframeUpper = timeframe.ToUpper();
+        
+        // 先查缓存
+        var cachedKlines = await db.Queryable<MarketKlineCache>()
+            .Where(k => k.Symbol == symbolUpper 
+                      && k.AssetType == assetTypeUpper 
+                      && k.Timeframe == timeframeUpper)
+            .OrderByDescending(k => k.Timestamp)
+            .Take(limit)
+            .ToListAsync();
+        
+        // 缓存足够，直接返回
+        if (cachedKlines.Count >= limit)
+        {
+            _logger.LogDebug("历史K线缓存命中: {Symbol} {AssetType} {Timeframe}, 数量: {Count}", symbol, assetType, timeframe, cachedKlines.Count);
+            return cachedKlines.Select(k => new MarketDataResponse
+            {
+                Symbol = k.Symbol,
+                Open = k.Open,
+                High = k.High,
+                Low = k.Low,
+                Close = k.Close,
+                Volume = k.Volume ?? 0,
+                Timestamp = k.Timestamp,
+                AssetType = k.AssetType
+            }).OrderBy(k => k.Timestamp).ToList();
+        }
+
+        // 缓存不足，调用API补全
+        List<MarketDataResponse> response;
+        string source;
         if (assetType.Equals("Crypto", StringComparison.OrdinalIgnoreCase))
         {
-            return await GetCryptoHistoricalDataAsync(symbol, timeframe, limit);
+            response = await GetCryptoHistoricalDataAsync(symbol, timeframe, limit);
+            source = "OKX";
         }
         else
         {
             // 默认走股票数据源
-            return await GetStockHistoricalDataAsync(symbol, timeframe, limit);
+            response = await GetStockHistoricalDataAsync(symbol, timeframe, limit);
+            source = "Tiingo";
         }
+
+        // 批量写入缓存（去重）
+        var cacheEntities = response.Select(k => new MarketKlineCache
+        {
+            Id = GenerateMd5Hash($"{symbolUpper}_{assetTypeUpper}_{timeframeUpper}_{k.Timestamp:yyyyMMddHHmmss}"),
+            Symbol = symbolUpper,
+            AssetType = assetTypeUpper,
+            Timeframe = timeframeUpper,
+            Timestamp = k.Timestamp,
+            Open = k.Open,
+            High = k.High,
+            Low = k.Low,
+            Close = k.Close,
+            Volume = k.Volume,
+            Source = source,
+            FetchedAt = DateTime.Now
+        }).ToList();
+
+        // 批量插入，存在则忽略
+        await db.Storageable(cacheEntities)
+            .WhereColumns(it => new { it.Id })
+            .ExecuteCommandAsync();
+        
+        _logger.LogDebug("历史K线缓存写入: {Symbol} {AssetType} {Timeframe}, 数量: {Count}", symbol, assetType, timeframe, cacheEntities.Count);
+        return response;
     }
 
     /// <summary>
@@ -293,6 +406,35 @@ public class MarketDataService : IMarketDataService
             _ => endDate.AddDays(-limit)
         };
     }
+
+    /// <summary>
+    /// 生成MD5哈希（用于缓存键）
+    /// </summary>
+    private string GenerateMd5Hash(string input)
+    {
+        using var md5 = MD5.Create();
+        var inputBytes = Encoding.UTF8.GetBytes(input);
+        var hashBytes = md5.ComputeHash(inputBytes);
+        var sb = new StringBuilder();
+        foreach (var b in hashBytes)
+        {
+            sb.Append(b.ToString("x2"));
+        }
+        return sb.ToString();
+    }
+
+    /// <summary>
+    /// 获取缓存过期时间
+    /// </summary>
+    private DateTime GetCacheExpirationTime(string assetType)
+    {
+        return assetType.ToLower() switch
+        {
+            "stock" => DateTime.Now.AddMinutes(15), // 股票缓存15分钟
+            "crypto" => DateTime.Now.AddMinutes(1), // 加密货币缓存1分钟
+            _ => DateTime.Now.AddMinutes(15)
+        };
+    }
 }
 
 // Tiingo 响应模型