diff --git a/src/ppt/graph/ppt_composer_node.py b/src/ppt/graph/ppt_composer_node.py
index df7a0f8..9c0e692 100644
--- a/src/ppt/graph/ppt_composer_node.py
+++ b/src/ppt/graph/ppt_composer_node.py
@@ -21,7 +21,7 @@ def ppt_composer_node(state: PPTState):
     model = get_llm_by_type(AGENT_LLM_MAP["ppt_composer"])
     ppt_content = model.invoke(
         [
-            SystemMessage(content=get_prompt_template("ppt/ppt_composer")),
+            SystemMessage(content=get_prompt_template("ppt/ppt_composer", locale=state.get("locale", "en-US"))),
             HumanMessage(content=state["input"]),
         ],
     )
diff --git a/src/ppt/graph/state.py b/src/ppt/graph/state.py
index 9c32457..d8bdb86 100644
--- a/src/ppt/graph/state.py
+++ b/src/ppt/graph/state.py
@@ -10,7 +10,7 @@ class PPTState(MessagesState):
 
     # Input
     input: str = ""
-
+    locale: str = ""
     # Output
     generated_file_path: str = ""
 
diff --git a/src/server/app.py b/src/server/app.py
index 01da160..12e7eff 100644
--- a/src/server/app.py
+++ b/src/server/app.py
@@ -751,7 +751,7 @@ async def generate_ppt(request: GeneratePPTRequest):
         report_content = request.content
         print(report_content)
         workflow = build_ppt_graph()
-        final_state = workflow.invoke({"input": report_content})
+        final_state = workflow.invoke({"input": report_content, "locale": request.locale})
         generated_file_path = final_state["generated_file_path"]
         with open(generated_file_path, "rb") as f:
             ppt_bytes = f.read()
diff --git a/src/server/chat_request.py b/src/server/chat_request.py
index 3dc18f4..8fe81ce 100644
--- a/src/server/chat_request.py
+++ b/src/server/chat_request.py
@@ -104,6 +104,9 @@ class GeneratePodcastRequest(BaseModel):
 
 class GeneratePPTRequest(BaseModel):
     content: str = Field(..., description="The content of the ppt")
+    locale: str = Field(
+        "en-US", description="Language locale for the conversation (e.g., en-US, zh-CN)"
+    )
 
 
 class GenerateProseRequest(BaseModel):