diff --git a/apm-protocol/apm-ui-protocol/src/main/resources/application.yml b/apm-protocol/apm-ui-protocol/src/main/resources/application.yml
deleted file mode 100644
index 0dddee92e..000000000
--- a/apm-protocol/apm-ui-protocol/src/main/resources/application.yml
+++ /dev/null
@@ -1,20 +0,0 @@
-#
-# Copyright 2017, OpenSkywalking Organization All rights reserved.
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-#
-# Project repository: https://github.com/OpenSkywalking/skywalking-ui
-#
-
-server:
-  port: 8080
diff --git a/apm-protocol/apm-ui-protocol/src/main/resources/ui-graphql/application-layer.graphqls b/apm-protocol/apm-ui-protocol/src/main/resources/ui-graphql/application-layer.graphqls
index e69de29bb..4889edf3f 100644
--- a/apm-protocol/apm-ui-protocol/src/main/resources/ui-graphql/application-layer.graphqls
+++ b/apm-protocol/apm-ui-protocol/src/main/resources/ui-graphql/application-layer.graphqls
@@ -0,0 +1,8 @@
+type AppServerList {
+   servers: [AppServerInfo!]
+}
+
+extend type Query {
+  getApplicationTopology(appId: ID!, duration: Duration!): ApplicationTopology
+  getServers(appId: ID!, duration: Duration!): AppServerList
+}
\ No newline at end of file
diff --git a/apm-protocol/apm-ui-protocol/src/main/resources/ui-graphql/common.graphqls b/apm-protocol/apm-ui-protocol/src/main/resources/ui-graphql/common.graphqls
index 7473866b3..679379c0f 100644
--- a/apm-protocol/apm-ui-protocol/src/main/resources/ui-graphql/common.graphqls
+++ b/apm-protocol/apm-ui-protocol/src/main/resources/ui-graphql/common.graphqls
@@ -38,3 +38,18 @@ enum Step{
   MINUTE
   SECOND
 }
+
+######################################
+# Common Metrics and Trends
+######################################
+type ResponseTimeTrend {
+  trendList: [Int!]
+}
+
+type TPSTrend {
+  trendList: [Int!]
+}
+
+type ThroughputTrend {
+  trendList: [Int!]
+}
\ No newline at end of file
diff --git a/apm-protocol/apm-ui-protocol/src/main/resources/ui-graphql/overview-layer.graphqls b/apm-protocol/apm-ui-protocol/src/main/resources/ui-graphql/overview-layer.graphqls
index c101963ff..e06e9445a 100644
--- a/apm-protocol/apm-ui-protocol/src/main/resources/ui-graphql/overview-layer.graphqls
+++ b/apm-protocol/apm-ui-protocol/src/main/resources/ui-graphql/overview-layer.graphqls
@@ -96,12 +96,13 @@ type ApplicationBrief {
 }
 
 type ApplicationInfo {
+  id: ID!
   name: String!
   tps: Int!
 }
 
 extend type Query {
-  getApplicationTopology(duration: Duration!): ApplicationTopology
+  getClusterTopology(duration: Duration!): ApplicationTopology
   getClusterBrief(duration: Duration!): ClusterBrief
   getAlarmTrend(duration: Duration!): AlarmTrend
   getConjecturalApps(duration: Duration!): ConjecturalAppBrief
diff --git a/apm-protocol/apm-ui-protocol/src/main/resources/ui-graphql/server-layer.graphqls b/apm-protocol/apm-ui-protocol/src/main/resources/ui-graphql/server-layer.graphqls
index e69de29bb..3335dcd66 100644
--- a/apm-protocol/apm-ui-protocol/src/main/resources/ui-graphql/server-layer.graphqls
+++ b/apm-protocol/apm-ui-protocol/src/main/resources/ui-graphql/server-layer.graphqls
@@ -0,0 +1,19 @@
+# The server info.
+# At here, `Server` represents a process in OS,
+# e.g.
+#   1. Spring boot application
+#   2. A Tomcat server instance
+type AppServerInfo {
+  id: ID!
+  name: String!
+  tps: Int!
+  os: String
+  host: String
+  pid: Int
+  IPv4: String
+  IPv6: String
+}
+
+extend type Query {
+  
+}
\ No newline at end of file