diff --git a/AssetManager.Services/PortfolioNavService.cs b/AssetManager.Services/PortfolioNavService.cs
index cd1b1bf..dba62cc 100644
--- a/AssetManager.Services/PortfolioNavService.cs
+++ b/AssetManager.Services/PortfolioNavService.cs
@@ -469,22 +469,37 @@ public class PortfolioNavService : IPortfolioNavService
     }
 
     /// <summary>
-    /// 获取历史价格
+    /// 获取历史价格（优先从缓存读取）
     /// </summary>
     private async Task<decimal?> GetHistoricalPriceAsync(string symbol, string assetType, DateTime date)
     {
         try
         {
-            // 先尝试获取历史数据
-            var historicalData = await _marketDataService.GetHistoricalDataAsync(symbol, assetType, "1d", 365);
+            // 1. 先从缓存表查特定日期的价格
+            var cachedPrice = await _db.Queryable<MarketKlineCache>()
+                .Where(k => k.Symbol == symbol.ToUpper() 
+                         && k.AssetType == assetType.ToUpper()
+                         && k.Timeframe == "1D"
+                         && k.Timestamp.Date == date.Date)
+                .FirstAsync();
+
+            if (cachedPrice != null && cachedPrice.Close > 0)
+            {
+                _logger.LogDebug("缓存命中: {Symbol} {Date}, 价格: {Price}", symbol, date.ToString("yyyy-MM-dd"), cachedPrice.Close);
+                return cachedPrice.Close;
+            }
+
+            // 2. 缓存未命中，尝试获取该日期附近的历史数据
+            var historicalData = await _marketDataService.GetHistoricalDataAsync(symbol, assetType, "1d", 30);
             
+            // 精确匹配日期
             var priceOnDate = historicalData.FirstOrDefault(d => d.Timestamp.Date == date.Date);
             if (priceOnDate != null && priceOnDate.Close > 0)
             {
                 return priceOnDate.Close;
             }
 
-            // 如果找不到当天数据，找最近的
+            // 找最近的交易日价格
             var nearestPrice = historicalData
                 .Where(d => d.Timestamp.Date <= date.Date)
                 .OrderByDescending(d => d.Timestamp)
@@ -492,17 +507,18 @@ public class PortfolioNavService : IPortfolioNavService
 
             if (nearestPrice != null && nearestPrice.Close > 0)
             {
+                _logger.LogDebug("使用最近交易日价格: {Symbol} {Date} → {ActualDate}", 
+                    symbol, date.ToString("yyyy-MM-dd"), nearestPrice.Timestamp.ToString("yyyy-MM-dd"));
                 return nearestPrice.Close;
             }
 
-            // 最后尝试获取实时价格
+            // 3. 最后尝试获取实时价格
             var currentPrice = await _marketDataService.GetPriceAsync(symbol, assetType);
             if (currentPrice != null && currentPrice.Price > 0)
             {
                 return currentPrice.Price;
             }
 
-            // 无法获取有效价格
             _logger.LogWarning("无法获取有效价格: {Symbol}, {Date}", symbol, date);
             return null;
         }