diff --git a/.chronus/changes/fix-discriminator-initialize-2024-7-1-11-29-41.md b/.chronus/changes/fix-discriminator-initialize-2024-7-1-11-29-41.md
new file mode 100644
index 00000000000..2da987223c2
--- /dev/null
+++ b/.chronus/changes/fix-discriminator-initialize-2024-7-1-11-29-41.md
@@ -0,0 +1,7 @@
+---
+changeKind: fix
+packages:
+  - "@azure-tools/typespec-python"
+---
+
+Fix initialize for model which only has discriminator property
\ No newline at end of file
diff --git a/packages/typespec-python/generator/pygen/codegen/templates/model_dpg.py.jinja2 b/packages/typespec-python/generator/pygen/codegen/templates/model_dpg.py.jinja2
index afffb7f94e5..541de0f0441 100644
--- a/packages/typespec-python/generator/pygen/codegen/templates/model_dpg.py.jinja2
+++ b/packages/typespec-python/generator/pygen/codegen/templates/model_dpg.py.jinja2
@@ -45,7 +45,8 @@
     __flattened_items = ["{{ model.flattened_items|join('\", \"') }}"]
     {% endif %}
 
-    {% if not model.internal and serializer.init_line(model) %}
+    {% set need_init = (not model.internal) and (serializer.init_line(model) or model.discriminator)%}
+    {% if need_init %}
     @overload
     def __init__(
         self,
@@ -64,7 +65,7 @@
 
     {% endif %}
     {% set initialize_properties = serializer.initialize_properties(model) %}
-    {% if not model.internal and serializer.init_line(model) or initialize_properties %}
+    {% if need_init or initialize_properties %}
     def __init__(self, *args: Any, **kwargs: Any) -> None:{{ '# pylint: disable=useless-super-delegation' if not initialize_properties else '' }}
         {% for line in serializer.super_call(model) %}
         {{ line }}