diff --git a/api/core/workflow/node_runtime.py b/api/core/workflow/node_runtime.py
index 10c8963c90..2cf13bff0d 100644
--- a/api/core/workflow/node_runtime.py
+++ b/api/core/workflow/node_runtime.py
@@ -153,6 +153,10 @@ class DifyPreparedLLM(PreparedLLMProtocol):
     def parameters(self) -> Mapping[str, Any]:
         return self._model_instance.parameters
 
+    @parameters.setter
+    def parameters(self, value: Mapping[str, Any]) -> None:
+        self._model_instance.parameters = value
+
     @property
     def stop(self) -> Sequence[str] | None:
         return self._model_instance.stop
diff --git a/api/dify_graph/nodes/llm/runtime_protocols.py b/api/dify_graph/nodes/llm/runtime_protocols.py
index 64c1d8a925..f7d2322289 100644
--- a/api/dify_graph/nodes/llm/runtime_protocols.py
+++ b/api/dify_graph/nodes/llm/runtime_protocols.py
@@ -27,6 +27,9 @@ class PreparedLLMProtocol(Protocol):
     @property
     def parameters(self) -> Mapping[str, Any]: ...
 
+    @parameters.setter
+    def parameters(self, value: Mapping[str, Any]) -> None: ...
+
     @property
     def stop(self) -> Sequence[str] | None: ...