diff --git a/FIT5032-Assignment/Controllers/AppointmentsController.cs b/FIT5032-Assignment/Controllers/AppointmentsController.cs
index bb5d7bc..6d0598b 100644
--- a/FIT5032-Assignment/Controllers/AppointmentsController.cs
+++ b/FIT5032-Assignment/Controllers/AppointmentsController.cs
@@ -117,11 +117,13 @@ namespace FIT5032_Assignment.Controllers {
       if (userProfile.role == 1) { // patient
         var dbData = db.Appointments.Where(a => a.patient == userProfile.uuid).OrderByDescending(a => a.createdAt).ToList();
         foreach (var item in dbData) {
+          Trace.WriteLine(item.uuid);
           appointments.Add(new Tuple<Appointments, Users>(item, db.Users.Find(item.responsibleBy)));
         }
       } else if (userProfile.role == 2) { // doctor
         var dbData = db.Appointments.Where(a => a.responsibleBy == userProfile.uuid).OrderByDescending(a => a.createdAt).ToList();
         foreach (var item in dbData) {
+          Trace.WriteLine(item.uuid);
           appointments.Add(new Tuple<Appointments, Users>(item, db.Users.Find(item.patient)));
         }
       }
@@ -135,6 +137,59 @@ namespace FIT5032_Assignment.Controllers {
       return View();
     }
 
+    public ActionResult Approve(string id) {
+      // Check login
+      if (Request.Cookies["psg_auth_token"] == null) {
+        // Redirect to home page
+        return RedirectToAction("Index");
+      }
+      var user = psgCredentialVerify(Request.Cookies["psg_auth_token"].Value);
+      if (user == null) {
+        // Redirect to home page
+        Response.Cookies["psg_auth_token"].Expires = DateTime.Now.AddDays(-1);
+        return RedirectToAction("Index");
+      }
+      var userProfile = loginInfo(user);
+      if (userProfile == null) {
+        // Redirect to home page, and remove cookies
+        Response.Cookies["psg_auth_token"].Expires = DateTime.Now.AddDays(-1);
+        return RedirectToAction("Index");
+      }
+      // Detect user role
+      ViewBag.role = db.Users.Find(userProfile.uuid).role;
+
+      // Only doctor can approve appointment
+      if (userProfile.role != 2) {
+        TempData["tip"] = "This operation is not allowed.";
+        return Redirect("/Appointments/Index");
+      }
+
+      // Check if the appointment is belong to the doctor or patient
+      var appointment = db.Appointments.Find(id);
+      if (appointment == null) {
+        TempData["tip"] = "The appointment does not exist.";
+        return Redirect("/Appointments/Index");
+      }
+      if (appointment.responsibleBy != userProfile.uuid) {
+        TempData["tip"] = "The appointment does not exist.";
+        return Redirect("/Appointments/Index");
+      }
+
+      // Check status == 0
+      if (appointment.status != 0) {
+        TempData["tip"] = "Operation invalid";
+        return Redirect("/Appointments/Index");
+      }
+
+      // Update status
+      appointment.status = 1;
+      db.Entry(appointment).State = EntityState.Modified;
+      db.SaveChanges();
+
+      TempData["tip"] = "The appointment has been approved.";
+      return Redirect("/Appointments/Index");
+    }
+
     // GET: Appointments/Create
     public ActionResult Create(string id) {
       if (Request.Cookies["psg_auth_token"] == null) {
diff --git a/FIT5032-Assignment/Views/Appointments/Index.cshtml b/FIT5032-Assignment/Views/Appointments/Index.cshtml
index a73fcbe..aa4431d 100644
--- a/FIT5032-Assignment/Views/Appointments/Index.cshtml
+++ b/FIT5032-Assignment/Views/Appointments/Index.cshtml
@@ -85,7 +85,7 @@
         </td>
         <td>
           @if (item.Item1.status == 0) {
-            <button class="btn btn-sm btn-primary">Approve</button>
+            <a href='./Approve/@item.Item1.uuid' class="btn btn-sm btn-primary">Approve</a>
             <button class="btn btn-sm btn-danger">Cancel</button>
           }
         </td>