diff --git a/data_platform/backtest_report.py b/data_platform/backtest_report.py
index b9a9cad26..c0fb6471d 100644
--- a/data_platform/backtest_report.py
+++ b/data_platform/backtest_report.py
@@ -5,15 +5,16 @@ BacktestReport - 标准化回测报告
 """
 
 import json
-from typing import Optional
+from typing import Optional, TYPE_CHECKING
 
-from data_platform.backtest_runner import BacktestResult
+if TYPE_CHECKING:
+    from data_platform.backtest_runner import BacktestResult
 
 
 class BacktestReport:
     """回测报告生成器"""
 
-    def __init__(self, result: BacktestResult):
+    def __init__(self, result: "BacktestResult"):
         self.result = result
 
     def to_text(self) -> str:
@@ -36,7 +37,6 @@ class BacktestReport:
             "-" * 60,
         ]
 
-        # 交易明细（最多显示20条）
         if r.trades:
             lines.append(f"  {'买入日':>12s}  {'卖出日':>12s}  {'买入价':>8s}  "
                         f"{'卖出价':>8s}  {'收益率':>8s}  {'股数':>6s}")