diff --git a/src/postprocessing/visualization_reports.py b/src/postprocessing/visualization_reports.py
index 0071ed5..65b5a78 100644
--- a/src/postprocessing/visualization_reports.py
+++ b/src/postprocessing/visualization_reports.py
@@ -254,7 +254,7 @@ class WaterQualityVisualization:
         ax.set_ylabel('光谱反射率', fontsize=14, fontweight='bold')
         ax.set_title(f'{parameter_column} - 不同参数值的光谱曲线对比', 
                     fontsize=16, fontweight='bold')
-        ax.legend(loc='best', fontsize=10)
+        ax.legend(loc='upper left', fontsize=10, bbox_to_anchor=(1.02, 1), borderaxespad=0)
         ax.grid(True, alpha=0.3)
         
         if wavelength_range: