diff --git a/src/azure-cli/azure/cli/command_modules/resource/custom.py b/src/azure-cli/azure/cli/command_modules/resource/custom.py
index 5012984f1f0..098f75df3e5 100644
--- a/src/azure-cli/azure/cli/command_modules/resource/custom.py
+++ b/src/azure-cli/azure/cli/command_modules/resource/custom.py
@@ -389,8 +389,8 @@ def _deploy_arm_template_core_unmodified(cmd, resource_group_name, template_file
 
 
 class JsonCTemplate:
-    def __init__(self, template_as_bytes):
-        self.template_as_bytes = template_as_bytes
+    def __init__(self, template_string):
+        self.template_string = template_string
 
 
 class JSONSerializer(Serializer):
@@ -408,6 +408,7 @@ def body(self, data, data_type, **kwargs):
 
 class JsonCTemplatePolicy(SansIOHTTPPolicy):
 
+    # Obtain the template data from JsonCTemplate object, and then splice it with other properties into the JSONC format
     def on_request(self, request):
         http_request = request.http_request
         request_data = getattr(http_request, 'data', {}) or {}
@@ -422,14 +423,19 @@ def on_request(self, request):
             template = http_request.data["properties"]["template"]
             if not isinstance(template, JsonCTemplate):
                 raise ValueError()
-
             del http_request.data["properties"]["template"]
+
             # templateLink nad template cannot exist at the same time in deployment_dry_run mode
             if "templateLink" in http_request.data["properties"].keys():
                 del http_request.data["properties"]["templateLink"]
-            partial_request = json.dumps(http_request.data)
 
-            http_request.data = partial_request[:-2] + ", template:" + template.template_as_bytes + r"}}"
+            # The 'template' and other properties (such as 'parameters','mode'...) are spliced and encoded into the UTF-8 bytes as the request data
+            # The format of the request data is: {"properties": {"parameters": {...}, "mode": "Incremental", template:{\r\n  "$schema": "...",\r\n  "contentVersion": "...",\r\n  "parameters": {...}}}
+            # This is not an ordinary JSON format, but it is a JSONC format that service can deserialize
+            # If not do this splicing, the request data generated by default serialization cannot be deserialized on the service side.
+            # Because the service cannot deserialize the template element: "template": "{\r\n  \"$schema\": \"...\",\r\n  \"contentVersion\": \"...\",\r\n  \"parameters\": {...}}"
+            partial_request = json.dumps(http_request.data)
+            http_request.data = partial_request[:-2] + ", template:" + template.template_string + r"}}"
             http_request.data = http_request.data.encode('utf-8')