diff --git a/czsc/cobra/utils.py b/czsc/cobra/utils.py
index dd0cd3ba8d5c358d6cffd67875d899a0485ceb93..6ca727a4ddcfd29b14024c1c4e47339521b5f567 100644
--- a/czsc/cobra/utils.py
+++ b/czsc/cobra/utils.py
@@ -61,6 +61,7 @@ def kdj_gold_cross(kline: Union[List[dict], pd.DataFrame], just: bool = True):
         traceback.print_exc()
         return False
 
+
 def kdj_dead_cross(kline: Union[List[dict], pd.DataFrame], just: bool = True):
     """输入K线，判断KDJ是否死叉
 
diff --git a/czsc/plot.py b/czsc/plot.py
index 506b3f08b29593dc4cd15bdc379a6433b931b250..a76f11c2b40c2ce532d6878dd54dbe5b189f72b4 100644
--- a/czsc/plot.py
+++ b/czsc/plot.py
@@ -4,11 +4,10 @@
 
 """
 
-from pyecharts.options import HeatMapItem
 from pyecharts import options as opts
 from pyecharts.charts import HeatMap, Kline, Line, Bar, Scatter, Grid
 from pyecharts.commons.utils import JsCode
-from typing import List, Callable
+from typing import List
 
 
 def heat_map(data: List[dict],
@@ -33,7 +32,7 @@ def heat_map(data: List[dict],
     :return: 图表
     """
 
-    value = [HeatMapItem(value=[s['x'], s['y'], s['heat']]) for s in data]
+    value = [opts.HeatMapItem(value=[s['x'], s['y'], s['heat']]) for s in data]
     heat = [s['heat'] for s in data]
 
     if not x_label: