diff --git a/azure-pipelines.yml b/azure-pipelines.yml
index 609a0141c14..83f478b3810 100644
--- a/azure-pipelines.yml
+++ b/azure-pipelines.yml
@@ -858,6 +858,7 @@ jobs:
   - bash: |
       set -ev
       . env/bin/activate
+      python scripts/ci/service_name.py
       if [[ "$(System.PullRequest.TargetBranch)" != "" ]]; then
         azdev linter --ci-exclusions --min-severity medium --repo=./ --src=HEAD --tgt=origin/$(System.PullRequest.TargetBranch)
       else
diff --git a/scripts/ci/service_name.py b/scripts/ci/service_name.py
new file mode 100644
index 00000000000..a242ce74cb1
--- /dev/null
+++ b/scripts/ci/service_name.py
@@ -0,0 +1,58 @@
+#!/usr/bin/env python
+
+# --------------------------------------------------------------------------------------------
+# Copyright (c) Microsoft Corporation. All rights reserved.
+# Licensed under the MIT License. See License.txt in the project root for license information.
+# --------------------------------------------------------------------------------------------
+"""
+Check format of service_name.json. Command and AzureServiceName are required. Others are optional.
+Each highest level command group should have reference in service_name.json.
+"""
+import json
+
+from azure.cli.core import MainCommandsLoader, AzCli
+from azure.cli.core._help import AzCliHelp
+from azure.cli.core.commands import AzCliCommandInvoker
+from azure.cli.core.file_util import create_invoker_and_load_cmds_and_args, get_all_help
+from azure.cli.core.parser import AzCliCommandParser
+
+
+def main():
+    az_cli = AzCli(cli_name='az',
+                   commands_loader_cls=MainCommandsLoader,
+                   invocation_cls=AzCliCommandInvoker,
+                   parser_cls=AzCliCommandParser,
+                   help_cls=AzCliHelp)
+    create_invoker_and_load_cmds_and_args(az_cli)
+    help_files = get_all_help(az_cli)
+    high_command_set = set()
+    for help_file in help_files:
+        if help_file.command:
+            high_command_set.add(help_file.command.split()[0])
+    print('high_command_set:')
+    print(high_command_set)
+
+    # Load and check service_name.json
+    with open('src/azure-cli/service_name.json') as f:
+        service_names = json.load(f)
+    print('Verifying src/azure-cli/service_name.json')
+    service_name_map = {}
+    for service_name in service_names:
+        command = service_name['Command']
+        service = service_name['AzureServiceName']
+        if not command.startswith('az '):
+            raise Exception('{} does not start with az!'.format(command))
+        if not service:
+            raise Exception('AzureServiceName of {} is empty!'.format(command))
+        service_name_map[command[3:]] = service
+    print('service_name_map:')
+    print(service_name_map)
+
+    # Check existence in service_name.json
+    for high_command in high_command_set:
+        if high_command not in service_name_map:
+            raise Exception('No entry of {} in service_name.json. Please add one to the file.'.format(high_command))
+
+
+if __name__ == "__main__":
+    main()