diff --git a/flow-examples/blocks/inputs/__init__.py b/flow-examples/blocks/inputs/__init__.py
new file mode 100644
index 00000000..65b413b9
--- /dev/null
+++ b/flow-examples/blocks/inputs/__init__.py
@@ -0,0 +1,7 @@
+from oocana import Context
+
+def main(params, context: Context):
+    return {
+        "nullable_output": params.get("nullable_input"),
+        "default_output": params.get("default_input")
+    }
\ No newline at end of file
diff --git a/flow-examples/blocks/inputs/block.oo.yaml b/flow-examples/blocks/inputs/block.oo.yaml
new file mode 100644
index 00000000..de5d46f7
--- /dev/null
+++ b/flow-examples/blocks/inputs/block.oo.yaml
@@ -0,0 +1,15 @@
+executor:
+  name: python
+  options: 
+    entry: __init__.py
+inputs_def:
+  - handle: nullable_input
+    nullable: true
+  - handle: default_input
+    value: "default_value"
+  - handle: schema_input
+    json_schema:
+      type: "string"
+outputs_def:
+  - handle: nullable_output
+  - handle: default_output
\ No newline at end of file
diff --git a/flow-examples/flows/run-block/a/main.py b/flow-examples/flows/run-block/a/main.py
index c9141db4..1e625a28 100644
--- a/flow-examples/flows/run-block/a/main.py
+++ b/flow-examples/flows/run-block/a/main.py
@@ -6,10 +6,19 @@ async def main(inputs, context: Context):
     run_res.add_event_callback(lambda payload: print("event callback", payload))
     run_res.add_output_callback(lambda handle, value: print("output callback", handle, value))
     res = await run_res.finish()
-    assert res.get("error") is None
+    assert res.get("error") is None, "Expected no error, got: {}".format(res.get("error"))
 
     run_res = context.run_block("blk_bccc", inputs={"my_input": "111"})
     res = await run_res.finish()
-    assert res.get("error") is not None
+    assert res.get("error") is not None, "Expected error, got: {}".format(res.get("error"))
+
+
+    run_res = context.run_block("self::inputs", inputs={"schema_input": 111, "nullable_input": None, "default_input": "default_value"}, strict=True)
+    res = await run_res.finish()
+    assert res.get("error") is not None, "Expected error, got: {}".format(res.get("error"))
+
+    run_res = context.run_block("self::inputs", inputs={"schema_input": "aaa"})
+    res = await run_res.finish()
+    assert res.get("error") is None, "Expected no error, got: {}".format(res.get("error"))
 
     return {"a": "a"}
\ No newline at end of file
diff --git a/oocana/oocana/context.py b/oocana/oocana/context.py
index 0f14c096..356e2c3b 100644
--- a/oocana/oocana/context.py
+++ b/oocana/oocana/context.py
@@ -679,12 +679,17 @@ def response_callback(payload: Dict[str, Any]):
         return await f
         
 
-    def run_block(self, block: str, *, inputs: Dict[str, Any], additional_inputs_def: list[HandleDefDict] | None = None, additional_outputs_def: list[HandleDefDict] | None = None) -> RunResponse:
+    def run_block(self, block: str, *, inputs: Dict[str, Any], additional_inputs_def: list[HandleDefDict] | None = None, additional_outputs_def: list[HandleDefDict] | None = None, strict: bool = False) -> RunResponse:
         """
         :param block: the id of the block to run. format: `self::<block_name>` or `<package_name>::<block_name>`.
-        :param inputs: the inputs of the block. if the block has no inputs, this parameter can be dict. If the inputs missing some required inputs, the response's finish future will send {"error": "error message" }.
+        :param inputs: the inputs of the block. if the block has no inputs, this parameter can be dict. 
+                    If the inputs missing some required inputs, the response's finish future will send {"error": "<error message>" }.
+                    some missing inputs will be filled:
+                        1. with the default value if the block's input_def has a default value (which is defined in the value field).
+                        2. input_def's nullable is true, the missing input will be filled with Null.
         :param additional_inputs_def: additional inputs definitions, this is a list of dicts, each dict should contain the handle(required), description, json_schema, kind, nullable and is_additional fields. This is used to define additional inputs that are not defined in the block schema.
         :param additional_outputs_def: additional outputs definitions, this is a list of dicts, each dict should contain the handle(required), description, json_schema, kind, nullable and is_additional fields. This is used to define additional outputs that are not defined in the block schema.
+        :param strict: if True, oocana will use input_def's json_schema(only when it exists) to validate the inputs and if they are not valid oocana will reject to run this block, return error message. otherwise it will run with the inputs as they are.
         :return: a RunResponse object, which contains the event callbacks and output callbacks. You can use the `add_event_callback` and `add_output_callback` methods to register callbacks for the events and outputs of the block. You can also use the `finish` method to wait for the block to finish and get the result.
         Notice do not call any context.send_message or context.report_progress or context.preview and other context methods(which will send message) directly in the callbacks, it may cause deadlock.
 
@@ -721,6 +726,7 @@ def run_block(self, block: str, *, inputs: Dict[str, Any], additional_inputs_def
                 "additional_outputs_def": additional_outputs_def,
             },
             "stacks": self.__block_info.stacks,
+            "strict": strict,
             "request_id": request_id,
         })