diff --git a/src/key.js b/src/key.js
new file mode 100644
index 000000000..d2faaa4e5
--- /dev/null
+++ b/src/key.js
@@ -0,0 +1,33 @@
+/**
+ * @file key.js
+ *
+ * 
+ * Store the unique key for the video data;
+ * @type {Object}
+ * @private
+ */
+
+let keyObject = {};
+
+/**
+ * Test if wo have stored the key
+ *
+ * @param  {String}  The uri of the key which we need to load;
+ * @return {Boolean} do we have stored the key which we want to load;
+ * @function getStoredKey
+ */
+export function getStoredKey(uri) {
+    if (keyObject[uri]) {
+        return keyObject[uri];
+    }
+    return false;
+}
+
+/**
+ * Store the key and uri
+ * @param {String} uri The uri of the key
+ * @param {Unit32Array} key The data of key in Uint32Array Typed Array
+ */
+export function setStoredKey(uri, key) {
+    keyObject[uri] = key;
+}
diff --git a/src/segment-loader.js b/src/segment-loader.js
index dd2dd88c6..5446ec6a9 100644
--- a/src/segment-loader.js
+++ b/src/segment-loader.js
@@ -9,6 +9,7 @@ import {Decrypter} from 'aes-decrypter';
 import mp4probe from 'mux.js/lib/mp4/probe';
 import Config from './config';
 import window from 'global/window';
+import {getStoredKey,setStoredKey} from './key';
 
 // in ms
 const CHECK_BUFFER_DELAY = 500;
@@ -615,12 +616,17 @@ export default class SegmentLoader extends videojs.EventTarget {
 
     // optionally, request the decryption key
     if (segment.key) {
-      let keyRequestOptions = videojs.mergeOptions(this.xhrOptions_, {
-        uri: segment.key.resolvedUri,
-        responseType: 'arraybuffer'
-      });
+      let bytes = getStoredKey(segment.key.uri);
+      if( bytes ){
+        segment.key.bytes = bytes;
+      }else{
+        let keyRequestOptions = videojs.mergeOptions(this.xhrOptions_, {
+          uri: segment.key.resolvedUri,
+          responseType: 'arraybuffer'
+        });
 
-      keyXhr = this.hls_.xhr(keyRequestOptions, this.handleResponse_.bind(this));
+        keyXhr = this.hls_.xhr(keyRequestOptions, this.handleResponse_.bind(this));
+      }
     }
 
     // optionally, request the associated media init segment
@@ -773,6 +779,8 @@ export default class SegmentLoader extends videojs.EventTarget {
         view.getUint32(12)
       ]);
 
+      setStoredKey(segment.key.uri,segment.key.bytes);
+
       // if the media sequence is greater than 2^32, the IV will be incorrect
       // assuming 10s segments, that would be about 1300 years
       segment.key.iv = segment.key.iv || new Uint32Array([