diff --git a/app/controllers/attachments_controller.rb b/app/controllers/attachments_controller.rb
index e0dd71467..6ef43c694 100644
--- a/app/controllers/attachments_controller.rb
+++ b/app/controllers/attachments_controller.rb
@@ -17,9 +17,11 @@ class AttachmentsController < ApplicationController
       redirect_to @file.cloud_url and return
     end
 
-    pdf_attachment = params[:disposition] || "attachment"
-    if pdf_attachment == "inline"
+    type_attachment = params[:disposition] || "attachment"
+    if type_attachment == "inline"
       send_file absolute_path(local_path(@file)),filename: @file.title, disposition: 'inline',type: 'application/pdf'
+    elsif type_attachment == "MP4"
+      send_file_with_range absolute_path(local_path(@file)), disposition: 'inline', type: "video/mp4", range: true
     else
       send_file(absolute_path(local_path(@file)), filename: @file.title,stream:false, type: @file.content_type.presence || 'application/octet-stream')
     end
@@ -202,4 +204,31 @@ class AttachmentsController < ApplicationController
     end
   end
 
+  def send_file_with_range(path, options = {})
+    logger.info("########request.headers: #{request.headers}")
+    logger.info("########request.headers: #{File.exist?(path)}")
+
+    if File.exist?(path)
+      size = File.size(path)
+      logger.info("########request.headers: #{request.headers}")
+      if !request.headers["Range"]
+        status_code = 200 # 200 OK
+        offset = 0
+        length = File.size(path)
+      else
+        status_code = 206 # 206 Partial Content
+        bytes = Rack::Utils.byte_ranges(request.headers, size)[0]
+        offset = bytes.begin
+        length = bytes.end - bytes.begin
+      end
+      response.header["Accept-Ranges"] = "bytes"
+      response.header["Content-Range"] = "bytes #{bytes.begin}-#{bytes.end}/#{size}" if bytes
+      response.header["status"] = status_code
+
+      send_data IO.binread(path, length, offset), options
+    else
+      raise ActionController::MissingFile, "Cannot read file #{path}."
+    end
+  end
+
 end
diff --git a/public/react/src/modules/courses/Resource/Fileslistitem.js b/public/react/src/modules/courses/Resource/Fileslistitem.js
index 348303116..b038c836f 100644
--- a/public/react/src/modules/courses/Resource/Fileslistitem.js
+++ b/public/react/src/modules/courses/Resource/Fileslistitem.js
@@ -1,5 +1,5 @@
 import React,{ Component } from "react";
-import { WordsBtn,ActionBtn,getmyUrl } from 'educoder';
+import { WordsBtn,ActionBtn,getmyUrl,getUrl } from 'educoder';
 import {Tooltip,message,Input, Button} from 'antd';
 import {Link} from 'react-router-dom';
 import axios from 'axios'
@@ -60,7 +60,8 @@ class Fileslistitem extends Component{
 				if(list.content_type==="video/mp4"){
 					this.setState({
 						videoModalObj:true,
-						file_url:getmyUrl(list.url+'?file_name='+list.title),
+						file_url:"https://"+document.domain+list.url+'?file_name='+list.title+"&disposition=MP4",
+						// file_url:getUrl()+list.url+'?file_name='+list.title+'&disposition=MP4',
 					})
 					return
 				}else{
@@ -92,7 +93,9 @@ class Fileslistitem extends Component{
 						if(list.content_type==="video/mp4"){
 							this.setState({
 								videoModalObj:true,
-								file_url:getmyUrl(list.url+'?file_name='+list.title),
+								file_url:"https://"+document.domain+list.url+'?file_name='+list.title+'&disposition=MP4',
+								// file_url:getUrl()+list.url+'?file_name='+list.title+'&disposition=MP4',
+
 							})
 							return
 						}else{
@@ -127,9 +130,10 @@ class Fileslistitem extends Component{
 
 	Clicktobroadcastthevideo=(bool,url)=>{
 			this.setState({
-									videoModalObj:bool,
-									file_url:getmyUrl(url),
-		})
+				videoModalObj:bool,
+				 file_url:"https://"+document.domain+url+'&disposition=MP4',
+				// file_url:getUrl()+url+'&disposition=MP4',
+			})
 	}
 
 
@@ -215,8 +219,11 @@ class Fileslistitem extends Component{
 		const { checkBox,
 			discussMessage,index
 		} = this.props;
-		console.log("Fileslistitem");
-		console.log(file_url);
+		// console.log("Fileslistitem");
+		// console.log( document.domain);
+		// console.log(this.props.imhost);
+		// console.log( window.location.href);
+
 		return(
 			<div className="graduateTopicList boardsList">
 				{
@@ -228,16 +235,16 @@ class Fileslistitem extends Component{
 							width={800 - 1}
 						>
 							<video
-								autoplay="true"
-								src={file_url} controls="true" controlslist="nodownload">
+								preload="auto"
+								src={file_url} controls="true" >
 								您的浏览器不支持 video 标签。
 							</video>
-							{/*<div className="df copyLine">*/}
-							{/*	<Input value={file_url}*/}
-							{/*				 className="dark"*/}
-							{/*	></Input>*/}
-							{/*	<ActionBtn className="copybtn" data-clipboard-text={file_url} onClick={() =>this.copyurls()}>复制视频地址</ActionBtn>*/}
-							{/*</div>*/}
+							<div className="df copyLine">
+								<Input value={file_url}
+											 className="dark"
+								></Input>
+								<ActionBtn className="copybtn" data-clipboard-text={file_url} onClick={() =>this.copyurls()}>复制视频地址</ActionBtn>
+							</div>
 						</HeadlessModal>
 
 						:""
@@ -256,7 +263,7 @@ class Fileslistitem extends Component{
 					{...this.props}
 					visible={this.state.Showoldfiles}
 					allfiles={this.state.allfiles}
-					Clicktobroadcastthevideo={(bool,urls)=>this.Clicktobroadcastthevideo(bool,urls)}
+					Clicktobroadcastthevideo={(bool,urls,index)=>this.Clicktobroadcastthevideo(bool,urls,index)}
 					closaoldfilesprops={this.closaoldfilesprops}
 				/>
 				<style>{`
diff --git a/public/react/src/modules/courses/Resource/index.js b/public/react/src/modules/courses/Resource/index.js
index 501176882..8187cd5af 100644
--- a/public/react/src/modules/courses/Resource/index.js
+++ b/public/react/src/modules/courses/Resource/index.js
@@ -1,6 +1,6 @@
 import React,{ Component } from "react";
 import { Input, Checkbox, Table, Tooltip, Pagination,Spin } from "antd";
-import { WordsBtn,on, off, trigger } from 'educoder';
+import { WordsBtn,on, off, trigger ,getUrl} from 'educoder';
 import axios from 'axios';
 import Modals from '../../modals/Modals';
 import Sendtofilesmodal from "../coursesPublic/SendToFilesModal";
@@ -15,7 +15,6 @@ import _ from 'lodash'
 import './style.css';
 import '../css/members.css';
 import moment from 'moment';
-
 class Fileslists extends Component{
   constructor(props){
     super(props);
@@ -1062,4 +1061,4 @@ export default Fileslists;
 	{/*<div className="edu-tab-con-box clearfix edu-txt-center">*/}
 		{/*<img className="edu-nodata-img mb20"  src="/images/educoder/nodata.png" />*/}
 		{/*<p className="edu-nodata-p mb20">暂时还没有相关数据哦！</p></div>*/}
-{/*</div>*/}
\ No newline at end of file
+{/*</div>*/}
diff --git a/public/react/src/modules/courses/coursesPublic/Showoldfiles.js b/public/react/src/modules/courses/coursesPublic/Showoldfiles.js
index 3b4928d4d..53148913f 100644
--- a/public/react/src/modules/courses/coursesPublic/Showoldfiles.js
+++ b/public/react/src/modules/courses/coursesPublic/Showoldfiles.js
@@ -49,6 +49,9 @@ class Showoldfiles extends Component{
 	isaboxonClick=(item)=>{
 		this.props.Clicktobroadcastthevideo(true,item.url+'&file_name='+item.title);
 	}
+	isaboxonClicks=(item)=>{
+		this.props.Clicktobroadcastthevideo(true,item.url+'?file_name='+item.title);
+	}
 	render(){
 		let {visible,allfiles}=this.props;
 
@@ -188,7 +191,7 @@ class Showoldfiles extends Component{
 
 														{
 															allfiles&&allfiles.content_type&&allfiles.content_type==="video/mp4"?
-																<a  className={"isabox"} target="_blank"  onClick={()=>this.isaboxonClick(allfiles)}>{allfiles.title}</a>
+																<a  className={"isabox"} target="_blank"  onClick={()=>this.isaboxonClicks(allfiles)}>{allfiles.title}</a>
 																:
 																<a className={"isabox"} href={allfiles.url} target="_blank" >{allfiles.title}</a>
 														}