diff --git a/projects/IoTCenter/Controllers/AppController.cs b/projects/IoTCenter/Controllers/AppController.cs
index ab29143b..f6495c5f 100644
--- a/projects/IoTCenter/Controllers/AppController.cs
+++ b/projects/IoTCenter/Controllers/AppController.cs
@@ -328,13 +328,26 @@ namespace IoTCenter.Controllers
             }
         }
 
-        private string GetColor(object key)
-        {
-            var randomGen = new Random();
-            var names = (KnownColor[])Enum.GetValues(typeof(KnownColor));
-            var randomColorName = names[randomGen.Next(names.Length)];
-            var randomColor = Color.FromKnownColor(randomColorName);
-            return randomColor.Name;
+        private string GetColor(string key)
+        {
+            //var randomGen = new Random();
+            //var names = (KnownColor[])Enum.GetValues(typeof(KnownColor));
+            //var randomColorName = names[randomGen.Next(names.Length)];
+            //var randomColor = Color.FromKnownColor(randomColorName);
+            //return randomColor.Name;
+            if (key == "Humidity")
+            {
+                return Color.FromKnownColor(KnownColor.Green).Name;
+            }
+            else if (key == "Electricity")
+            {
+                return Color.FromKnownColor(KnownColor.Red).Name;
+            }
+            else if (key == "Light")
+            {
+                return Color.FromKnownColor(KnownColor.Orange).Name;
+            }
+            return Color.FromKnownColor(KnownColor.Blue).Name;
         }
 
         /************************************************************/
diff --git a/projects/IoTClient/Assets/StreamingAssets/wwwroot/js/node.js b/projects/IoTClient/Assets/StreamingAssets/wwwroot/js/node.js
index f9fd2633..49111fc0 100644
--- a/projects/IoTClient/Assets/StreamingAssets/wwwroot/js/node.js
+++ b/projects/IoTClient/Assets/StreamingAssets/wwwroot/js/node.js
@@ -24,7 +24,7 @@ function UpdateChart(deviceNumber) {
                     var data = response.data;
                     UpdateChartInternal(canvas, device.DisplayName, data);
                     console.log('折线图更新成功');
-                    toastr.success('折线图更新成功');
+                    toastr.info('折线图更新成功');
                 })
                 .catch(function (error) {
                     console.log(error);