diff --git a/src/master/vclustermgr.py b/src/master/vclustermgr.py
index b7ef839..a09a3a9 100755
--- a/src/master/vclustermgr.py
+++ b/src/master/vclustermgr.py
@@ -116,6 +116,8 @@ class VclusterMgr(object):
     def create_cluster(self, clustername, username, image, user_info, setting):
         if self.is_cluster(clustername, username):
             return [False, "cluster:%s already exists" % clustername]
+        if self.imgmgr.get_image_size(image) + 100 > int(setting["disk"]):
+            return [False, "the size of disk is not big enough for the image"]
         clustersize = int(self.defaultsize)
         logger.info ("starting cluster %s with %d containers for %s" % (clustername, int(clustersize), username))
         workers = self.nodemgr.get_nodeips()
@@ -202,6 +204,8 @@ class VclusterMgr(object):
     def scale_out_cluster(self,clustername,username, image,user_info, setting):
         if not self.is_cluster(clustername,username):
             return [False, "cluster:%s not found" % clustername]
+        if self.imgmgr.get_image_size(image) + 100 > int(setting["disk"]):
+            return [False, "the size of disk is not big enough for the image"]
         workers = self.nodemgr.get_nodeips()
         if (len(workers) == 0):
             logger.warning("no workers to start containers, scale out failed")
diff --git a/src/utils/imagemgr.py b/src/utils/imagemgr.py
index fcb8873..889023a 100755
--- a/src/utils/imagemgr.py
+++ b/src/utils/imagemgr.py
@@ -380,6 +380,29 @@ class ImageMgr():
             return ""
         return image.description
 
+    def get_image_size(self, image):
+        imagename = image['name']
+        imagetype = image['type']
+        imageowner = image['owner']
+        if imagename == "base" and imagetype == "base":
+            return 0
+        if imagetype == "private":
+            imgpath = self.imgpath + "private/" + user + "/"
+        else:
+            imgpath = self.imgpath + "public/" + imageowner + "/"
+        return os.stat(os.path.join(imgpath, imagename)).st_size // (1024*1024)
+
+
+    def format_size(self, size_in_byte):
+        if size_in_byte < 1024:
+            return str(size_in_byte) + "B"
+        elif size_in_byte < 1024*1024:
+            return str(size_in_byte//1024) + "KB"
+        elif size_in_byte < 1024*1024*1024:
+            return str(size_in_byte//(1024*1024)) + "MB"
+        else:
+            return str(size_in_byte//(1024*1024*1024)) + "GB"
+
     def list_images(self,user):
         images = {}
         images["private"] = []
@@ -398,6 +421,9 @@ class ImageMgr():
                 [time, description] = self.get_image_info(user, imagename, "private")
                 fimage["time"] = time
                 fimage["description"] = description
+                fimage["size"] = os.stat(os.path.join(imgpath, image)).st_size
+                fimage["size_format"] = self.format_size(fimage["size"])
+                fimage["size_in_mb"] = fimage["size"] // (1024*1024)
                 images["private"].append(fimage)
         except Exception as e:
             logger.error(e)
@@ -423,6 +449,9 @@ class ImageMgr():
                         [time, description] = self.get_image_info(public_user, imagename, "public")
                         fimage["time"] = time
                         fimage["description"] = description
+                        fimage["size"] = os.stat(os.path.join(imgpath, image)).st_size
+                        fimage["size_format"] = self.format_size(fimage["size"])
+                        fimage["size_in_mb"] = fimage["size"] // (1024*1024)
                         images["public"][public_user].append(fimage)
                 except Exception as e:
                     logger.error(e)
diff --git a/web/templates/addCluster.html b/web/templates/addCluster.html
index 1a7b8ca..de6ac2e 100644
--- a/web/templates/addCluster.html
+++ b/web/templates/addCluster.html
@@ -64,6 +64,7 @@
 						    	<th>ImageName</th>
 							<th>Type</th>
 							<th>Owner</th>
+							<th>Size</th>
 							<th>Description</th>
 							<th>Choose</th>
 						    </tr>
@@ -73,16 +74,18 @@
 							<td>base</td>
 							<td>public</td>
 							<td>docklet</td>
+							<td>--</td>
 							<td>A base image for you</td>
-							<td><div class="i-checks"><label><input type="radio" name="image" value="base_base_base" checked="checked"></label></div></td>
+							<td><div class="i-checks"><label><input type="radio" name="image" value="base_base_base" checked="checked" onchange="setMinDiskSize(0)"></label></div></td>
 						    </tr>
 						    {% for image in images['private'] %}
 						    <tr>
 							<td>{{image['name']}}</td>
 							<td>private</td>
 							<td>{{user}}</td>
+							<td>{{image['size_format']}}</td>
 							<td><a href="/image/{{masterips[0].split("@")[0]}}/description/{{image['name']}}_{{user}}_private/" target="_blank">{{image['description']}}</a></td>
-							<td><div class="i-checks"><label><input type="radio" name="image" value="{{image['name']}}_{{user}}_private"></label></div></td>
+							<td><div class="i-checks"><label><input type="radio" name="image" value="{{image['name']}}_{{user}}_private" onchange="setMinDiskSize({{image['size_in_mb']}})"></label></div></td>
 						    </tr>
 						    {% endfor %}
 						    {% for p_user,p_images in images['public'].items() %}
@@ -91,8 +94,9 @@
 								<td>{{image['name']}}</td>
 								<td>public</td>
 								<td>{{p_user}}</td>
+								<td>{{image['size_format']}}</td>	
 								<td><a href="/image/{{masterips[0].split("@")[0]}}/description/{{image['name']}}_{{p_user}}_public/" target="_blank">{{image['description']}}</a></td>
-								<td><div class="i-checks"><label><input type="radio" name="image" value="{{image['name']}}_{{p_user}}_public"></label></div></td>
+								<td><div class="i-checks"><label><input type="radio" name="image" value="{{image['name']}}_{{p_user}}_public" onchange="setMinDiskSize({{image['size_in_mb']}})"></label></div></td>
 						    	</tr>
 							{% endfor %}
 						    {% endfor %}
@@ -125,7 +129,7 @@
                                     </div>
 				                    <div class="form-group">
                                         <label class="col-sm-2 control-label">DISK</label>
-                                        <div class="col-sm-3"><input type="number" class="form-control" name="diskSetting" id="diskSetting" value= {{defaultsetting['disk']}}  /> {{usage['disk']}} MB/{{quota['disk']}}MB
+                                        <div class="col-sm-3"><input type="number" class="form-control" name="diskSetting" id="diskSetting" value= {{defaultsetting['disk']}}  /> {{usage['disk']}} MB/{{quota['disk']}}MB (min value is the size of image + 100)
                                         </div>
                                     </div>
                                 </div>
@@ -167,6 +171,12 @@
 	<script src="http://cdn.bootcss.com/datatables/1.10.11/js/dataTables.bootstrap.js"></script>
 	<script src="http://cdn.bootcss.com/datatables-tabletools/2.1.5/js/TableTools.min.js"></script>
 
+	<script type="text/javascript">
+		function setMinDiskSize(minSize) {
+			var disk = document.getElementById('diskSetting');
+			disk.setAttribute('min', minSize+100);
+		}
+	</script>
 
     <script type="text/javascript">
 		$("select#masterselector").change(function() {
diff --git a/web/templates/config.html b/web/templates/config.html
index 97330c0..488175c 100755
--- a/web/templates/config.html
+++ b/web/templates/config.html
@@ -80,6 +80,7 @@
 										<th>ImageName</th>
 										<th>Type</th>
 										<th>Owner</th>
+                    <th>Size</th>
 										<th>Choose</th>
 									</tr>
 								</thead>
@@ -88,6 +89,7 @@
 										<td>base</td>
 										<td>public</td>
 										<td>docklet</td>
+                    <td>--</td>
 										<td><input type="radio" name="image" value="base_base_base" checked="checked"></td>
 									</tr>
 									{% for image in allimages[master]['private'] %}
@@ -95,6 +97,7 @@
 										<td>{{image['name']}}</td>
 										<td>private</td>
 										<td>{{mysession['username']}}</td>
+                    <td>{{image['size_format']}}</td>
 										<td><input type="radio" name="image" value="{{image['name']}}_{{mysession['username']}}_private"></td>
 									</tr>
 									{% endfor %}
@@ -104,6 +107,7 @@
 											<td>{{image['name']}}</td>
 											<td>public</td>
 											<td>{{p_user}}</td>
+                      <td>{{image['size_format']}}</td>
 											<td><input type="radio" name="image" value="{{image['name']}}_{{p_user}}_public"></td>
 										</tr>
 										{% endfor %}
@@ -327,6 +331,7 @@
                              <th>Type</th>
 			     <th>Owner</th>
 			     <th>CreateTime</th>
+           <th>Size</th>
 			     <th>Description</th>
 			     <th>Location</th>
 			     <th>Status</th>
@@ -339,6 +344,7 @@
 				<td>public</td>
 				<td>docklet</td>
 				<td>2015-01-01 00:00:00</td>
+        <td>--</td>
 				<td>A Base Image For You</td>
 				<td>--</td>
 				<td></td>
@@ -351,6 +357,7 @@
 				<td>private</td>
 				<td>{{mysession['username']}}</td>
 				<td>{{image['time']}}</td>
+        <td>{{image['size_format']}}</td>
 				<td><a href="/image/{{master.split("@")[0]}}/description/{{image['name']}}_{{mysession['username']}}_private/" target="_blank">{{image['description']}}</a></td>
 				<td>{{master.split("@")[1]}}</td>
 				{% if image['isshared'] == 'false' %}
@@ -414,6 +421,7 @@
 				<td>public</td>
 				<td>{{p_user}}</td>
 				<td>{{image['time']}}</td>
+        <td>{{image['size_format']}}</td>
 				<td><a href="/image/{{master.split("@")[0]}}/description/{{image['name']}}_{{p_user}}_public/" target="_blank">{{image['description']}}</a></td>
 				<td>{{master.split("@")[1]}}</td>
 				<td></td>