diff --git a/package.json b/package.json
index 19f463f..cbd7cf5 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@antv/data-set",
-  "version": "0.10.1",
+  "version": "0.10.2",
   "description": "data set with state management",
   "main": "build/data-set.js",
   "browser": "build/data-set.js",
diff --git a/src/util/get-series-values.js b/src/util/get-series-values.js
index e703b5c..a235448 100644
--- a/src/util/get-series-values.js
+++ b/src/util/get-series-values.js
@@ -1,6 +1,6 @@
 
 module.exports = (extent, bw) => {
-  let bandwidth = bw || 1;
+  const bandwidth = bw || 1;
   const [ min, max ] = extent;
   const values = [];
   let tmp = min;