diff --git a/__tests__/situation/load.js b/__tests__/situation/load.js
index 5fe870d0..959623e9 100644
--- a/__tests__/situation/load.js
+++ b/__tests__/situation/load.js
@@ -127,7 +127,7 @@ describe('load', () => {
     expect(player.src).toBe('');
   });
 
-  test('should not trigger switch kernel at the first auto load', () => {
+  test('should not block normal video event at the first auto load', () => {
     const fn = jest.fn();
     const plugin = {
       name: 'test',
@@ -147,4 +147,22 @@ describe('load', () => {
     expect(fn).toHaveBeenCalledTimes(1);
     player.destroy();
   });
+
+  test('should not switch kernel at the first auto load', () => {
+    let originalVideo;
+    const plugin = {
+      name: 'test',
+      create() {
+        originalVideo = this.$video;
+      },
+    };
+    Chimee.install(plugin);
+    const player = new Chimee({
+      wrapper: document.createElement('div'),
+      src: 'http://cdn.toxicjohann.com/lostStar.mp4',
+      plugins: [ plugin.name ],
+    });
+    expect(originalVideo === player.$video).toBe(true);
+    player.destroy();
+  });
 });
diff --git a/src/dispatcher/index.js b/src/dispatcher/index.js
index a9339436..a1959940 100644
--- a/src/dispatcher/index.js
+++ b/src/dispatcher/index.js
@@ -1,6 +1,7 @@
 // @flow
 import { isString, camelize, deepAssign, isObject, isEmpty, isArray, isFunction, transObjectAttrIntoArray, isPromise, Log, runRejectableQueue, addEvent, removeEvent, isError, deepClone } from 'chimee-helper';
 import ChimeeKernel from './kernel';
+import { getLegalBox } from './kernel';
 import Plugin from './plugin';
 import Dom from './dom';
 import VideoConfig from 'config/video';
@@ -415,12 +416,14 @@ export default class Dispatcher {
     const videoConfig = this.videoConfig;
     const {
       isLive = videoConfig.isLive,
-      box = videoConfig.box,
+      box = getLegalBox({ src, box: videoConfig.box }),
       preset = videoConfig.preset,
       kernels = videoConfig.kernels,
       isFirst,
     } = option;
+    delete option.isFirst;
     if (box !== 'native' || box !== oldBox || !isEmpty(option)) {
+      option.isFirst = isFirst;
       const video = document.createElement('video');
       const config = { isLive, box, preset, src, kernels };
       const kernel = this._createKernel(video, config);
diff --git a/src/dispatcher/kernel.js b/src/dispatcher/kernel.js
index 9741de77..e37920a2 100644
--- a/src/dispatcher/kernel.js
+++ b/src/dispatcher/kernel.js
@@ -6,9 +6,21 @@ const LOG_TAG = 'chimee';
 const boxSuffixMap = {
   flv: '.flv',
   hls: '.m3u8',
-  mp4: '.mp4',
+  native: '.mp4',
 };
 
+// return the config box
+// or choose the right one according to the src
+export function getLegalBox({ src, box }: { src: string, box: string }): string {
+  if (isString(box) && box) return box;
+  src = src.toLowerCase();
+  for (const key in boxSuffixMap) {
+    const suffix = boxSuffixMap[key];
+    if (src.indexOf(suffix) > -1) return key;
+  }
+  return 'native';
+}
+
 export default class ChimeeKernel {
   box: string;
   boxConfig: Object;
@@ -34,7 +46,7 @@ export default class ChimeeKernel {
 
   initVideoKernel() {
     const config = this.config;
-    const box = this.chooseBox(config);
+    const box = getLegalBox(config);
     this.box = box;
     const VideoKernel = this.chooseVideoKernel(this.box, config.preset);
 
@@ -50,18 +62,6 @@ export default class ChimeeKernel {
     this.videoKernel = new VideoKernel(this.videoElement, config, customConfig);
   }
 
-  // return the config box
-  // or choose the right one according to the src
-  chooseBox({ src, box }: { src: string, box: string }): string {
-    if (isString(box) && box) return box;
-    src = src.toLowerCase();
-    for (const key in boxSuffixMap) {
-      const suffix = boxSuffixMap[key];
-      if (src.indexOf(suffix) > -1) return key;
-    }
-    return 'native';
-  }
-
   // choose the right video kernel according to the box setting
   chooseVideoKernel(box: string, preset: { [string]: Function }): VideoKernel {
     switch (box) {