diff --git a/scripts/generate_legacy_report.py b/scripts/generate_legacy_report.py
index ac4ab67..3736bba 100644
--- a/scripts/generate_legacy_report.py
+++ b/scripts/generate_legacy_report.py
@@ -170,7 +170,14 @@ def run_with_legacy_report():
                 else:
                     continue
                 # 对齐净值数据到回测日期（使用ffill处理日期差异）
-                nav_aligned = nav_series.reindex(backtest_result.index, method='ffill')
+                # 先去除重复日期
+                if nav_series.index.has_duplicates:
+                    nav_series = nav_series[~nav_series.index.duplicated(keep='last')]
+                # 确保 backtest_result.index 无重复
+                target_index = backtest_result.index
+                if target_index.has_duplicates:
+                    target_index = target_index[~target_index.duplicated(keep='last')]
+                nav_aligned = nav_series.reindex(target_index, method='ffill')
                 etf_nav_data_raw[idx_code] = nav_aligned.values
     
     # 生成原引擎格式的报告