diff --git a/app/utils/draw.py b/app/utils/draw.py
index 7f0d49fc93464182d2ca20e3e7302634c29c7ab2..74bdfbb209e82942cb03c94054cb13576f568abf 100644
--- a/app/utils/draw.py
+++ b/app/utils/draw.py
@@ -416,6 +416,7 @@ def draw_index_combination_chart(compare_data):
     # return return_compare_img
     filename = str(uuid.uuid4()) + '.png'
     fig.savefig(temp_img_save_folder + filename, format='png', bbox_inches='tight')
+    plt.clf()
     return_path = template_folder + filename
     return return_path