diff --git a/lib/zin/wg/thinkappeals/js/v1.js b/lib/zin/wg/thinkappeals/js/v1.js
index d514a9f73e..02d403043f 100644
--- a/lib/zin/wg/thinkappeals/js/v1.js
+++ b/lib/zin/wg/thinkappeals/js/v1.js
@@ -11,6 +11,23 @@ window.formatSeriesLabel = function(params)
     return params?.value?.toFixed(2);
 }
 
+/**
+ * 格式化图例名称。
+ * Format the legend name.
+ *
+ * @param  string name
+ * @access public
+ * @return string
+ */
+window.formatLegend = function(name)
+{
+    const parts = name.split('/');
+    if(parts.length > 0) name = `{bolder|${parts[0]}}/${parts.slice(1).join(' ')}`;
+    const reg       = /[\u4E00-\u9FA5]/;
+    const threshold = !reg.test(name) ? 60 : 30;
+    return name.length > threshold ? name.substr(0, threshold) + '...' : name;
+}
+
 /**
  * 初始化 $APPEALS 图表数据后的回调函数。
  * The callback function after initializing the $APPEALS chart data.