diff --git a/demos/gallery-graphanalyzer.html b/demos/gallery-graphanalyzer.html
index 54bae54f2..1205ef68c 100644
--- a/demos/gallery-graphanalyzer.html
+++ b/demos/gallery-graphanalyzer.html
@@ -10,6 +10,7 @@
   <script src="../build/plugin.tool.mapper.js"></script>
   <script src="../build/plugin.tool.fisheye.js"></script>
   <script src="../build/plugin.util.extractSubgraph.js"></script>
+  <!-- <script src="../build/plugin.util.maxSpanningForest.js"></script> -->
   <script src="../build/plugin.tool.highlightSubgraph.js"></script>
   <script src="../build/plugin.edge.quadraticCurve.js"></script>
   <script src="../build/plugin.tool.minimap.js"></script>
@@ -132,7 +133,6 @@
       if (minimap !== undefined) minimap.style.display = 'none';
       if (legend !== undefined) legend.style.display = 'none';
     });
-
   </script>
 
 </body>
diff --git a/plugins/layout.forceAtlas2/layout.js b/plugins/layout.forceAtlas2/layout.js
index 63a044138..4387df214 100644
--- a/plugins/layout.forceAtlas2/layout.js
+++ b/plugins/layout.forceAtlas2/layout.js
@@ -195,6 +195,7 @@ class Layout {
       worker.terminate();
       loading.style.display = 'none';
       onLayoutComplete();
+
     };
   }
 }
diff --git a/plugins/template.maxSpanningForest/README.md b/plugins/template.maxSpanningForest/README.md
new file mode 100644
index 000000000..e06a7d4a5
--- /dev/null
+++ b/plugins/template.maxSpanningForest/README.md
@@ -0,0 +1,43 @@
+## maxSpanningForest
+
+template.maxSpanningForest for jiuselu graph analyzer, which is a plugin for graph. This is a collection of fundamental functions, including:
+- the style of the nodes and graphs,
+- extracting max spanning forest, 
+- Force Atlas 2 layout algorithm( with webworker ), 
+- interactions
+  - extracting subgraph
+  - highlight subgraph
+  - fisheye lens
+  - onclick
+  - menu operations
+
+parameter for this plugin:
+- layoutCfg: the configuration for layout.
+  - max_iteration: the number of iteration for terminating the layout algorithm
+  - kg: the gravity parameter for layout. The larger kg, more compact the graph, expecialy for the isolated subgraphs.
+  - prev_overlapping: whether preventing the node overlapping
+  - onLayoutComplete: a listener for layout completement. When the layout is complete, the loading div and img disappear.
+
+## use
+
+simple use.
+
+```js
+const MaxSpanningForestPlugin = G6.Plugins['template.maxSpanningForest'];
+//the instances of plugins
+const maxSpanningForest = new MaxSpanningForestPlugin({
+  layoutCfg: {
+    max_iteration: 600,
+    kg: 10,
+    prev_overlapping: true,
+    onLayoutComplete: function () {
+      const minimap = document.getElementById('minimap');
+      const legend = document.getElementById('legend');
+      if (minimap !== undefined) minimap.style.display = 'block';
+      if (legend !== undefined) legend.style.display = 'block';
+    }
+  }
+});
+
+      
+```
\ No newline at end of file
diff --git a/plugins/tool.mapper/index.js b/plugins/tool.mapper/index.js
index 90a7d6c12..cab3a0d1f 100644
--- a/plugins/tool.mapper/index.js
+++ b/plugins/tool.mapper/index.js
@@ -11,6 +11,7 @@ const Size = require('@antv/g2/src/component/legend/size');
 const Attr = require('@antv/attr');
 const Util = G6.Util;
 const Scale = require('@antv/scale');
+
 class Plugin {
   constructor(itemType, dim, channel, range, otherCfg) {
     Util.mix(this, {