diff --git a/backend/app/models/paper_trading.py b/backend/app/models/paper_trading.py
index 33229d2..c10872d 100644
--- a/backend/app/models/paper_trading.py
+++ b/backend/app/models/paper_trading.py
@@ -5,6 +5,7 @@ from enum import Enum
 from datetime import datetime
 from sqlalchemy import Column, Integer, String, Float, DateTime, JSON, Text, Enum as SQLEnum
 from app.models.database import Base
+from app.utils.datetime_utils import get_beijing_time
 
 
 class OrderStatus(str, Enum):
@@ -88,7 +89,7 @@ class PaperOrder(Base):
     trailing_stop_base_profit = Column(Float, default=0)  # 移动止损触发时的盈利百分比
 
     # 时间戳
-    created_at = Column(DateTime, default=datetime.utcnow)
+    created_at = Column(DateTime, default=lambda: get_beijing_time())
     opened_at = Column(DateTime, nullable=True)        # 开仓时间
     closed_at = Column(DateTime, nullable=True)        # 平仓时间
 
@@ -99,6 +100,12 @@ class PaperOrder(Base):
 
     def to_dict(self):
         """转换为字典"""
+        # 格式化时间字段（北京时间字符串）
+        def format_time(dt):
+            if dt is None:
+                return None
+            return dt.strftime('%Y-%m-%d %H:%M:%S')
+
         return {
             'id': self.id,
             'order_id': self.order_id,
@@ -125,8 +132,8 @@ class PaperOrder(Base):
             'breakeven_triggered': self.breakeven_triggered,
             'trailing_stop_triggered': getattr(self, 'trailing_stop_triggered', 0),
             'trailing_stop_base_profit': getattr(self, 'trailing_stop_base_profit', 0),
-            'created_at': self.created_at.isoformat() if self.created_at else None,
-            'opened_at': self.opened_at.isoformat() if self.opened_at else None,
-            'closed_at': self.closed_at.isoformat() if self.closed_at else None,
+            'created_at': format_time(self.created_at),
+            'opened_at': format_time(self.opened_at),
+            'closed_at': format_time(self.closed_at),
             'entry_reasons': self.entry_reasons,
         }
diff --git a/backend/app/services/paper_trading_service.py b/backend/app/services/paper_trading_service.py
index 7866544..0d29fa5 100644
--- a/backend/app/services/paper_trading_service.py
+++ b/backend/app/services/paper_trading_service.py
@@ -2,25 +2,14 @@
 模拟交易服务 - 订单管理和盈亏统计
 """
 import uuid
-from datetime import datetime, timedelta, timezone
+from datetime import datetime, timedelta
 from typing import Dict, Any, List, Optional
 
 from app.models.paper_trading import PaperOrder, OrderStatus, OrderSide, SignalGrade, EntryType
 from app.services.db_service import db_service
 from app.config import get_settings
 from app.utils.logger import logger
-
-
-def get_beijing_time() -> datetime:
-    """
-    获取东八区（北京时间）当前时间
-
-    Returns:
-        东八区的当前时间
-    """
-    utc_time = datetime.utcnow().replace(tzinfo=timezone.utc)
-    beijing_tz = timezone(timedelta(hours=8))
-    return utc_time.astimezone(beijing_tz).replace(tzinfo=None)
+from app.utils.datetime_utils import get_beijing_time
 
 
 class PaperTradingService:
diff --git a/backend/app/utils/datetime_utils.py b/backend/app/utils/datetime_utils.py
new file mode 100644
index 0000000..4b170d5
--- /dev/null
+++ b/backend/app/utils/datetime_utils.py
@@ -0,0 +1,27 @@
+"""
+时间工具模块
+提供统一的时间处理函数
+"""
+from datetime import datetime, timezone, timedelta
+
+
+def get_beijing_time() -> datetime:
+    """
+    获取东八区（北京时间）当前时间
+
+    Returns:
+        东八区的当前时间（无时区信息的naive datetime）
+    """
+    utc_time = datetime.utcnow().replace(tzinfo=timezone.utc)
+    beijing_tz = timezone(timedelta(hours=8))
+    return utc_time.astimezone(beijing_tz).replace(tzinfo=None)
+
+
+def get_utc_time() -> datetime:
+    """
+    获取UTC当前时间
+
+    Returns:
+        UTC当前时间（无时区信息的naive datetime）
+    """
+    return datetime.utcnow()
diff --git a/frontend/trading.html b/frontend/trading.html
index 39c5728..091a203 100644
--- a/frontend/trading.html
+++ b/frontend/trading.html
@@ -2149,13 +2149,15 @@
 
                 formatTime(timeStr) {
                     if (!timeStr) return '-';
-                    const date = new Date(timeStr);
-                    return date.toLocaleString('zh-CN', {
-                        month: '2-digit',
-                        day: '2-digit',
-                        hour: '2-digit',
-                        minute: '2-digit'
-                    });
+                    // 后端已返回格式化的北京时间字符串，直接显示
+                    // 格式: "2026-03-13 18:30:00" -> 显示为 "03-13 18:30"
+                    const parts = timeStr.split(' ');
+                    if (parts.length >= 2) {
+                        const datePart = parts[0].substring(5); // "03-13"
+                        const timePart = parts[1].substring(0, 5); // "18:30"
+                        return `${datePart} ${timePart}`;
+                    }
+                    return timeStr;
                 },
 
                 formatStatus(status) {
@@ -2507,21 +2509,16 @@
                     return (this.totalUnrealizedPnl / this.totalPosition) * 100;
                 },
 
-                // 累计收益率
+                // 累计收益率（使用 account.initial_balance 作为基准，与顶部收益率一致）
                 totalReturn() {
-                    if (this.dailyReturns.length === 0) return 0;
-                    const firstDay = this.dailyReturns[0];
-                    const lastDay = this.dailyReturns[this.dailyReturns.length - 1];
-                    if (firstDay.balance === 0) return 0;
-                    return ((lastDay.balance - firstDay.balance) / firstDay.balance) * 100;
+                    if (!this.account.initial_balance || this.account.initial_balance === 0) return 0;
+                    return ((this.account.current_balance - this.account.initial_balance) / this.account.initial_balance) * 100;
                 },
 
                 // 累计收益额
                 totalReturnAmount() {
-                    if (this.dailyReturns.length === 0) return 0;
-                    const lastDay = this.dailyReturns[this.dailyReturns.length - 1];
-                    const firstDay = this.dailyReturns[0];
-                    return lastDay.balance - firstDay.balance;
+                    if (!this.account.initial_balance) return 0;
+                    return this.account.current_balance - this.account.initial_balance;
                 },
 
                 // 盈利天数