diff --git a/AssetManager.API/Controllers/PortfolioController.cs b/AssetManager.API/Controllers/PortfolioController.cs
index 002f8d7..af6537f 100644
--- a/AssetManager.API/Controllers/PortfolioController.cs
+++ b/AssetManager.API/Controllers/PortfolioController.cs
@@ -234,7 +234,7 @@ public class PortfolioController : ControllerBase
     /// <param name="id">投资组合ID</param>
     /// <returns>投资组合详情（含持仓明细）</returns>
     [HttpGet("{id}")]
-    public ActionResult<ApiResponse<PortfolioDetailResponse>> GetPortfolioById(string id)
+    public async Task<ActionResult<ApiResponse<PortfolioDetailResponse>>> GetPortfolioById(string id)
     {
         try
         {
@@ -251,7 +251,7 @@ public class PortfolioController : ControllerBase
 
             _logger.LogInformation($"Request to get portfolio by id: {id}");
             
-            var response = _portfolioService.GetPortfolioById(id, userId);
+            var response = await _portfolioService.GetPortfolioByIdAsync(id, userId);
 
             _logger.LogInformation("Portfolio retrieved successfully");
             
diff --git a/AssetManager.API/Program.cs b/AssetManager.API/Program.cs
index c5b3c05..f285134 100644
--- a/AssetManager.API/Program.cs
+++ b/AssetManager.API/Program.cs
@@ -79,6 +79,9 @@ else
     builder.Services.AddScoped<AssetManager.Infrastructure.Services.IMarketDataService, AssetManager.Infrastructure.Services.MarketDataService>();
 }
 
+// 汇率服务：预留接口，目前用 Mock 实现
+builder.Services.AddScoped<AssetManager.Infrastructure.Services.IExchangeRateService, AssetManager.Infrastructure.Services.MockExchangeRateService>();
+
 // 策略引擎
 builder.Services.AddScoped<AssetManager.Infrastructure.StrategyEngine.IStrategyEngine, AssetManager.Infrastructure.StrategyEngine.StrategyEngine>();
 
diff --git a/AssetManager.Infrastructure/Services/IExchangeRateService.cs b/AssetManager.Infrastructure/Services/IExchangeRateService.cs
new file mode 100644
index 0000000..8dc96ef
--- /dev/null
+++ b/AssetManager.Infrastructure/Services/IExchangeRateService.cs
@@ -0,0 +1,24 @@
+namespace AssetManager.Infrastructure.Services;
+
+/// <summary>
+/// 汇率服务接口（预留，后续实现多币种汇总）
+/// </summary>
+public interface IExchangeRateService
+{
+    /// <summary>
+    /// 获取汇率（从源币种转换为目标币种）
+    /// </summary>
+    /// <param name="fromCurrency">源币种（如 CNY）</param>
+    /// <param name="toCurrency">目标币种（如 USD）</param>
+    /// <returns>汇率（1 单位源币种可兑换的目标币种数量）</returns>
+    Task<decimal> GetExchangeRateAsync(string fromCurrency, string toCurrency);
+
+    /// <summary>
+    /// 转换金额
+    /// </summary>
+    /// <param name="amount">金额</param>
+    /// <param name="fromCurrency">源币种</param>
+    /// <param name="toCurrency">目标币种</param>
+    /// <returns>转换后的金额</returns>
+    Task<decimal> ConvertAmountAsync(decimal amount, string fromCurrency, string toCurrency);
+}
diff --git a/AssetManager.Infrastructure/Services/MockExchangeRateService.cs b/AssetManager.Infrastructure/Services/MockExchangeRateService.cs
new file mode 100644
index 0000000..25d4722
--- /dev/null
+++ b/AssetManager.Infrastructure/Services/MockExchangeRateService.cs
@@ -0,0 +1,57 @@
+using Microsoft.Extensions.Logging;
+
+namespace AssetManager.Infrastructure.Services;
+
+/// <summary>
+/// Mock 汇率服务（占位实现，后续接入真实汇率源）
+/// </summary>
+public class MockExchangeRateService : IExchangeRateService
+{
+    private readonly ILogger<MockExchangeRateService> _logger;
+
+    // 固定的 Mock 汇率（以 2026 年初为基准）
+    private readonly Dictionary<string, decimal> _mockRates = new()
+    {
+        { "CNY-USD", 0.14m },
+        { "USD-CNY", 7.10m },
+        { "CNY-HKD", 1.09m },
+        { "HKD-CNY", 0.92m },
+        { "USD-HKD", 7.75m },
+        { "HKD-USD", 0.13m },
+        { "CNY-CNY", 1.00m },
+        { "USD-USD", 1.00m },
+        { "HKD-HKD", 1.00m }
+    };
+
+    public MockExchangeRateService(ILogger<MockExchangeRateService> logger)
+    {
+        _logger = logger;
+    }
+
+    public Task<decimal> GetExchangeRateAsync(string fromCurrency, string toCurrency)
+    {
+        _logger.LogInformation("Mock 获取汇率: {FromCurrency} -> {ToCurrency}", fromCurrency, toCurrency);
+
+        string key = $"{fromCurrency}-{toCurrency}";
+        if (_mockRates.TryGetValue(key, out decimal rate))
+        {
+            return Task.FromResult(rate);
+        }
+
+        // 默认返回 1（同币种或不支持的币种）
+        return Task.FromResult(1.00m);
+    }
+
+    public Task<decimal> ConvertAmountAsync(decimal amount, string fromCurrency, string toCurrency)
+    {
+        _logger.LogInformation("Mock 转换金额: {Amount} {FromCurrency} -> {ToCurrency}", amount, fromCurrency, toCurrency);
+
+        if (fromCurrency == toCurrency)
+        {
+            return Task.FromResult(amount);
+        }
+
+        return GetExchangeRateAsync(fromCurrency, toCurrency)
+            .ContinueWith(t => amount * t.Result);
+    }
+}
diff --git a/AssetManager.Services/IPortfolioService.cs b/AssetManager.Services/IPortfolioService.cs
index f686d0f..ba70ca3 100644
--- a/AssetManager.Services/IPortfolioService.cs
+++ b/AssetManager.Services/IPortfolioService.cs
@@ -8,6 +8,7 @@ public interface IPortfolioService
     List<PortfolioListItem> GetPortfolios(string userId);
     TotalAssetsResponse GetTotalAssets(string userId);
     PortfolioDetailResponse GetPortfolioById(string id, string userId);
+    Task<PortfolioDetailResponse> GetPortfolioByIdAsync(string id, string userId);
     GetTransactionsResponse GetTransactions(string portfolioId, string userId, int limit, int offset);
     CreateTransactionResponse CreateTransaction(CreateTransactionRequest request, string userId);
 }
\ No newline at end of file
diff --git a/AssetManager.Services/PortfolioService.cs b/AssetManager.Services/PortfolioService.cs
index b5c761a..a9d7288 100644
--- a/AssetManager.Services/PortfolioService.cs
+++ b/AssetManager.Services/PortfolioService.cs
@@ -1,5 +1,6 @@
 using AssetManager.Data;
 using AssetManager.Models.DTOs;
+using AssetManager.Infrastructure.Services;
 using SqlSugar;
 
 namespace AssetManager.Services;
@@ -7,10 +8,12 @@ namespace AssetManager.Services;
 public class PortfolioService : IPortfolioService
 {
     private readonly ISqlSugarClient _db;
+    private readonly IMarketDataService _marketDataService;
 
-    public PortfolioService(ISqlSugarClient db)
+    public PortfolioService(ISqlSugarClient db, IMarketDataService marketDataService)
     {
         _db = db;
+        _marketDataService = marketDataService;
     }
 
     public CreatePortfolioResponse CreatePortfolio(CreatePortfolioRequest request, string userId)
@@ -132,7 +135,7 @@ public class PortfolioService : IPortfolioService
         };
     }
 
-    public PortfolioDetailResponse GetPortfolioById(string id, string userId)
+    public async Task<PortfolioDetailResponse> GetPortfolioByIdAsync(string id, string userId)
     {
         var portfolio = _db.Queryable<Portfolio>()
             .Where(p => p.Id == id && p.UserId == userId)
@@ -147,61 +150,94 @@ public class PortfolioService : IPortfolioService
             .Where(pos => pos.PortfolioId == id)
             .ToList();
 
-        var totalValue = (double)portfolio.TotalValue;
-        var positionItems = positions.Select(pos => 
+        // 获取每个持仓的实时价格并计算
+        decimal totalPortfolioValue = 0;
+        decimal totalCost = 0;
+        var positionItems = new List<PositionItem>();
+
+        foreach (var pos in positions)
         {
-            var positionValue = (double)(pos.Shares * pos.AvgPrice);
-            var ratio = totalValue > 0 ? (positionValue / totalValue) * 100 : 0;
-            // 假设目标权重为50%，计算偏离比例
-            var targetWeight = 50.0;
-            var deviationRatio = ratio - targetWeight;
-            
-            return new PositionItem
+            // 获取实时价格
+            MarketPriceResponse priceResponse;
+            if (pos.AssetType.Equals("Crypto", StringComparison.OrdinalIgnoreCase))
+            {
+                priceResponse = await _marketDataService.GetCryptoPriceAsync(pos.StockCode);
+            }
+            else
+            {
+                priceResponse = await _marketDataService.GetStockPriceAsync(pos.StockCode);
+            }
+
+            decimal currentPrice = priceResponse.Price;
+            decimal positionValue = pos.Shares * currentPrice;
+            decimal cost = pos.Shares * pos.AvgPrice;
+            decimal profit = positionValue - cost;
+            double profitRate = cost > 0 ? (double)(profit / cost * 100) : 0;
+
+            totalPortfolioValue += positionValue;
+            totalCost += cost;
+
+            positionItems.Add(new PositionItem
             {
                 id = pos.Id,
                 stockCode = pos.StockCode,
                 stockName = pos.StockName,
-                symbol = $"{pos.StockCode}.US", // 简化处理，实际应该根据市场或数据源确定
+                symbol = pos.StockCode,
                 amount = (int)pos.Shares,
                 averagePrice = (double)pos.AvgPrice,
-                currentPrice = (double)pos.AvgPrice, // 实际应该从市场数据获取
-                totalValue = positionValue,
-                profit = 0, // 实际应该计算
-                profitRate = 0, // 实际应该计算
-                changeAmount = 0, // 实际应该计算
-                ratio = ratio,
-                deviationRatio = deviationRatio,
+                currentPrice = (double)currentPrice,
+                totalValue = (double)positionValue,
+                profit = (double)profit,
+                profitRate = profitRate,
+                changeAmount = 0, // 今日盈亏后续实现
+                ratio = 0, // 后面统一计算比例
+                deviationRatio = 0, // 后续实现
                 currency = pos.Currency
-            };
-        }).ToList();
+            });
+        }
+
+        // 计算每个持仓的比例
+        foreach (var item in positionItems)
+        {
+            item.ratio = totalPortfolioValue > 0 ? (item.totalValue / (double)totalPortfolioValue) * 100 : 0;
+        }
+
+        decimal totalReturn = totalPortfolioValue - totalCost;
+        double totalReturnRate = totalCost > 0 ? (double)(totalReturn / totalCost * 100) : 0;
 
         return new PortfolioDetailResponse
         {
             id = portfolio.Id,
             name = portfolio.Name,
             currency = portfolio.Currency,
-            status = portfolio.Status, // 从数据库获取
+            status = portfolio.Status,
             strategy = new StrategyInfo
             {
                 id = portfolio.StrategyId,
                 name = "策略名称",
                 description = "策略描述"
             },
-            portfolioValue = totalValue,
-            totalReturn = (double)(portfolio.TotalValue * portfolio.ReturnRate),
-            todayProfit = 0, // 实际应该计算
-            historicalChange = 42.82, // 实际应该计算
-            dailyVolatility = 1240.50, // 实际应该计算
+            portfolioValue = (double)totalPortfolioValue,
+            totalReturn = (double)totalReturn,
+            todayProfit = 0, // 后续 P1-1 实现
+            historicalChange = totalReturnRate,
+            dailyVolatility = 0, // 后续实现
             todayProfitCurrency = portfolio.Currency,
-            logicModel = "HFEA 风险平价逻辑", // 实际应该根据策略获取
-            logicModelStatus = "监控中", // 实际应该根据策略状态获取
-            logicModelDescription = "目标权重 季度调仓", // 实际应该根据策略配置获取
+            logicModel = "HFEA 风险平价逻辑",
+            logicModelStatus = "监控中",
+            logicModelDescription = "目标权重 季度调仓",
             totalItems = positions.Count,
-            totalRatio = 100.0, // 所有持仓比例之和
+            totalRatio = 100.0,
             positions = positionItems
         };
     }
 
+    // 保留同步方法作为兼容（内部调用异步）
+    public PortfolioDetailResponse GetPortfolioById(string id, string userId)
+    {
+        return GetPortfolioByIdAsync(id, userId).GetAwaiter().GetResult();
+    }
+
     public GetTransactionsResponse GetTransactions(string portfolioId, string userId, int limit, int offset)
     {
         // 验证投资组合是否属于该用户