diff --git a/package-lock.json b/package-lock.json
index 43af4af444f5b858a667820e4f47d3dedf2968ce..012109abc7a5463d64055ada3bbfef7b21830d90 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "cxmooc-tools",
-  "version": "2.0.0",
+  "version": "2.0.1",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
@@ -1331,6 +1331,11 @@
         "domelementtype": "1"
       }
     },
+    "double-ended-queue": {
+      "version": "2.1.0-0",
+      "resolved": "https://registry.npmjs.org/double-ended-queue/-/double-ended-queue-2.1.0-0.tgz",
+      "integrity": "sha1-ED01J/0xUo9AGIEwyEHv3XgmTlw="
+    },
     "duplexify": {
       "version": "3.6.1",
       "resolved": "https://registry.npmjs.org/duplexify/-/duplexify-3.6.1.tgz",
@@ -2847,6 +2852,7 @@
       "resolved": "https://registry.npmjs.org/minipass/-/minipass-2.3.5.tgz",
       "integrity": "sha512-Gi1W4k059gyRbyVUZQ4mEqLm0YIUiGYfvxhF6SIlk3ui1WVxMTGfGdQ2SInh3PDrRTVvPKgULkpJtT4RH10+VA==",
       "dev": true,
+      "optional": true,
       "requires": {
         "safe-buffer": "^5.1.2",
         "yallist": "^3.0.0"
@@ -3741,6 +3747,26 @@
         }
       }
     },
+    "redis": {
+      "version": "2.8.0",
+      "resolved": "https://registry.npmjs.org/redis/-/redis-2.8.0.tgz",
+      "integrity": "sha512-M1OkonEQwtRmZv4tEWF2VgpG0JWJ8Fv1PhlgT5+B+uNq2cA3Rt1Yt/ryoR+vQNOQcIEgdCdfH0jr3bDpihAw1A==",
+      "requires": {
+        "double-ended-queue": "^2.1.0-0",
+        "redis-commands": "^1.2.0",
+        "redis-parser": "^2.6.0"
+      }
+    },
+    "redis-commands": {
+      "version": "1.4.0",
+      "resolved": "https://registry.npmjs.org/redis-commands/-/redis-commands-1.4.0.tgz",
+      "integrity": "sha512-cu8EF+MtkwI4DLIT0x9P8qNTLFhQD4jLfxLR0cCNkeGzs87FN6879JOJwNQR/1zD7aSYNbU0hgsV9zGY71Itvw=="
+    },
+    "redis-parser": {
+      "version": "2.6.0",
+      "resolved": "https://registry.npmjs.org/redis-parser/-/redis-parser-2.6.0.tgz",
+      "integrity": "sha1-Uu0J2srBCPGmMcB+m2mUHnoZUEs="
+    },
     "regex-not": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/regex-not/-/regex-not-1.0.2.tgz",
diff --git a/package.json b/package.json
index 013ff664b5a402ce7f17e1cfd11c63cf521f841d..ae0d60116ce52262d31b65c210b84aa1a3b81f46 100644
--- a/package.json
+++ b/package.json
@@ -31,6 +31,7 @@
     "body-parser": "^1.18.3",
     "express": "^4.16.3",
     "md5": "^2.2.1",
-    "mongodb": "^3.1.10"
+    "mongodb": "^3.1.10",
+    "redis": "^2.8.0"
   }
 }
diff --git a/src/server/listen.js b/src/server/listen.js
index 5f97aaf0a513f619b70b3664c3dc7d9f263badf5..c7b2a2d58cc29693651bf91e78a162c3bcb9cfa4 100644
--- a/src/server/listen.js
+++ b/src/server/listen.js
@@ -8,6 +8,7 @@ var path = require('path');
 var fs = require('fs');
 const http = require('http');
 const https = require('https');
+const redisCli = require('./redis');
 
 var privateKey = fs.readFileSync(path.join(__dirname, './certificate/private.key'), 'utf8');
 var certificate = fs.readFileSync(path.join(__dirname, './certificate/file.crt'), 'utf8');
@@ -32,6 +33,7 @@ httpsServer.listen(SSLPORT, function () {
 
 
 var mooc = new moocModel();
+var redis = new redisCli();
 
 app.use(bodyParser.json());
 app.use(bodyParser.urlencoded({
@@ -49,6 +51,13 @@ app.use(express.static(path.join(__dirname, 'static'), {
     maxage: '7d'
 }));
 
+//在线人数中间件
+app.use(function (req, res, next) {
+    var ip = getClientIp(req);
+    redis.onlineAdd(ip);
+    next();
+});
+
 app.get('/', function (req, res) {
     ret = '<h2>欢迎使用超星慕课刷课插件</h2><p>这个服务器将会记录你正确的答题答案,并不会记录你的任何账号信息</p>';
     ret += '<p>并且接口没有任何权限,全由插件提交上传,还请大家不要故意上传错误的答案 (๑• . •๑) </p><br/>';
@@ -143,11 +152,14 @@ function mergeAnswer(source, answer) {
 }
 
 app.get('/update', function (req, res) {
-    res.send({
-        version: config.version,
-        url: config.update,
-        enforce: config.enforce,
-        injection: config.injection
+    redis.onlineNum(function (err, data) {
+        res.send({
+            version: config.version,
+            url: config.update,
+            enforce: config.enforce,
+            injection: config.injection,
+            onlinenum: data
+        });
     });
 })
 
diff --git a/src/server/redis.js b/src/server/redis.js
new file mode 100644
index 0000000000000000000000000000000000000000..d52af4da7e0b15490e9a416434dc81d0159b6502
--- /dev/null
+++ b/src/server/redis.js
@@ -0,0 +1,18 @@
+var redis = require('redis');
+
+module.exports = function () {
+    var client = redis.createClient(6379,"127.0.0.1");
+    client.on("error", function (err) {
+        console.log("Redis error:" + err);
+    });
+    this.onlineAdd = function (ip) {
+        client.zadd("cxmooc:online", [Date.parse(new Date()), ip]);
+    }
+    this.onlineNum = function (call) {
+        var time = Date.parse(new Date());
+        client.zcount("cxmooc:online", [time - (5 * 60 * 1000), time], function (err, res) {
+            call(err, res)
+        });
+    }
+    return this
+}
\ No newline at end of file