diff --git a/trader/hyperliquid_trader.go b/trader/hyperliquid_trader.go
index 6e85940f..afb3393c 100644
--- a/trader/hyperliquid_trader.go
+++ b/trader/hyperliquid_trader.go
@@ -86,23 +86,54 @@ func NewHyperliquidTrader(privateKeyHex string, walletAddr string, testnet bool)
 func (t *HyperliquidTrader) GetBalance() (map[string]interface{}, error) {
 	log.Printf("🔄 正在调用Hyperliquid API获取账户余额...")
 
-	// 获取账户状态
+	// ✅ Step 1: 查询 Spot 现货账户余额
+	spotState, err := t.exchange.Info().SpotUserState(t.ctx, t.walletAddr)
+	var spotUSDCBalance float64 = 0.0
+	if err != nil {
+		log.Printf("⚠️ 查询 Spot 余额失败（可能无现货资产）: %v", err)
+	} else if spotState != nil && len(spotState.Balances) > 0 {
+		for _, balance := range spotState.Balances {
+			if balance.Coin == "USDC" {
+				spotUSDCBalance, _ = strconv.ParseFloat(balance.Total, 64)
+				log.Printf("✓ 发现 Spot 现货余额: %.2f USDC", spotUSDCBalance)
+				break
+			}
+		}
+	}
+
+	// ✅ Step 2: 查询 Perpetuals 合约账户状态
 	accountState, err := t.exchange.Info().UserState(t.ctx, t.walletAddr)
 	if err != nil {
-		log.Printf("❌ Hyperliquid API调用失败: %v", err)
+		log.Printf("❌ Hyperliquid Perpetuals API调用失败: %v", err)
 		return nil, fmt.Errorf("获取账户信息失败: %w", err)
 	}
 
 	// 解析余额信息（MarginSummary字段都是string）
 	result := make(map[string]interface{})
 
-	// 🔍 调试：打印API返回的完整CrossMarginSummary结构
-	summaryJSON, _ := json.MarshalIndent(accountState.MarginSummary, "  ", "  ")
-	log.Printf("🔍 [DEBUG] Hyperliquid API CrossMarginSummary完整数据:")
-	log.Printf("%s", string(summaryJSON))
+	// ✅ Step 3: 根据保证金模式动态选择正确的摘要（CrossMarginSummary 或 MarginSummary）
+	var accountValue, totalMarginUsed float64
+	var summaryType string
+	var summary interface{}
 
-	accountValue, _ := strconv.ParseFloat(accountState.MarginSummary.AccountValue, 64)
-	totalMarginUsed, _ := strconv.ParseFloat(accountState.MarginSummary.TotalMarginUsed, 64)
+	if t.isCrossMargin {
+		// 全仓模式：使用 CrossMarginSummary
+		accountValue, _ = strconv.ParseFloat(accountState.CrossMarginSummary.AccountValue, 64)
+		totalMarginUsed, _ = strconv.ParseFloat(accountState.CrossMarginSummary.TotalMarginUsed, 64)
+		summaryType = "CrossMarginSummary (全仓)"
+		summary = accountState.CrossMarginSummary
+	} else {
+		// 逐仓模式：使用 MarginSummary
+		accountValue, _ = strconv.ParseFloat(accountState.MarginSummary.AccountValue, 64)
+		totalMarginUsed, _ = strconv.ParseFloat(accountState.MarginSummary.TotalMarginUsed, 64)
+		summaryType = "MarginSummary (逐仓)"
+		summary = accountState.MarginSummary
+	}
+
+	// 🔍 调试：打印API返回的完整摘要结构
+	summaryJSON, _ := json.MarshalIndent(summary, "  ", "  ")
+	log.Printf("🔍 [DEBUG] Hyperliquid API %s 完整数据:", summaryType)
+	log.Printf("%s", string(summaryJSON))
 
 	// ⚠️ 关键修复：从所有持仓中累加真正的未实现盈亏
 	totalUnrealizedPnl := 0.0
@@ -119,16 +150,47 @@ func (t *HyperliquidTrader) GetBalance() (map[string]interface{}, error) {
 	// 需要返回"不包含未实现盈亏的钱包余额"
 	walletBalanceWithoutUnrealized := accountValue - totalUnrealizedPnl
 
-	result["totalWalletBalance"] = walletBalanceWithoutUnrealized // 钱包余额（不含未实现盈亏）
-	result["availableBalance"] = accountValue - totalMarginUsed   // 可用余额（总净值 - 占用保证金）
-	result["totalUnrealizedProfit"] = totalUnrealizedPnl          // 未实现盈亏
+	// ✅ Step 4: 使用 Withdrawable 欄位（PR #443）
+	// Withdrawable 是官方提供的真实可提现余额，比简单计算更可靠
+	availableBalance := 0.0
+	if accountState.Withdrawable != "" {
+		withdrawable, err := strconv.ParseFloat(accountState.Withdrawable, 64)
+		if err == nil && withdrawable > 0 {
+			availableBalance = withdrawable
+			log.Printf("✓ 使用 Withdrawable 作为可用余额: %.2f", availableBalance)
+		}
+	}
 
-	log.Printf("✓ Hyperliquid 账户: 总净值=%.2f (钱包%.2f+未实现%.2f), 可用=%.2f, 保证金占用=%.2f",
+	// 降级方案：如果没有 Withdrawable，使用简单计算
+	if availableBalance == 0 && accountState.Withdrawable == "" {
+		availableBalance = accountValue - totalMarginUsed
+		if availableBalance < 0 {
+			log.Printf("⚠️ 计算出的可用余额为负数 (%.2f)，重置为 0", availableBalance)
+			availableBalance = 0
+		}
+	}
+
+	// ✅ Step 5: 正確處理 Spot + Perpetuals 余额
+	// 重要：Spot 只加到總資產，不加到可用餘額
+	//      原因：Spot 和 Perpetuals 是獨立帳戶，需手動 ClassTransfer 才能轉帳
+	totalWalletBalance := walletBalanceWithoutUnrealized + spotUSDCBalance
+
+	result["totalWalletBalance"] = totalWalletBalance      // 總資產（Perp + Spot）
+	result["availableBalance"] = availableBalance          // 可用餘額（僅 Perpetuals，不含 Spot）
+	result["totalUnrealizedProfit"] = totalUnrealizedPnl   // 未實現盈虧（僅來自 Perpetuals）
+	result["spotBalance"] = spotUSDCBalance                // Spot 現貨餘額（單獨返回）
+
+	log.Printf("✓ Hyperliquid 完整账户:")
+	log.Printf("  • Spot 现货余额: %.2f USDC （需手动转账到 Perpetuals 才能开仓）", spotUSDCBalance)
+	log.Printf("  • Perpetuals 合约净值: %.2f USDC (钱包%.2f + 未实现%.2f)",
 		accountValue,
 		walletBalanceWithoutUnrealized,
-		totalUnrealizedPnl,
-		result["availableBalance"],
-		totalMarginUsed)
+		totalUnrealizedPnl)
+	log.Printf("  • Perpetuals 可用余额: %.2f USDC （可直接用於開倉）", availableBalance)
+	log.Printf("  • 保证金占用: %.2f USDC", totalMarginUsed)
+	log.Printf("  • 總資產 (Perp+Spot): %.2f USDC", totalWalletBalance)
+	log.Printf("  ⭐ 总资产: %.2f USDC | Perp 可用: %.2f USDC | Spot 余额: %.2f USDC",
+		totalWalletBalance, availableBalance, spotUSDCBalance)
 
 	return result, nil
 }