diff --git a/moveos/moveos-stdlib/moveos-stdlib/sources/move_action.move b/moveos/moveos-stdlib/moveos-stdlib/sources/move_action.move
new file mode 100644
index 0000000000..4257e769f8
--- /dev/null
+++ b/moveos/moveos-stdlib/moveos-stdlib/sources/move_action.move
@@ -0,0 +1,74 @@
+module moveos_std::move_action{
+    
+    use std::error;
+    use std::string::{String};
+    use std::option::{Self, Option};
+
+    const EInvalidType: u64 = 1;
+
+    struct ScriptCall has store, copy, drop {
+        code: vector<u8>,
+        //It is hard to implement TypeTag in Move, so we use String instead
+        ty_args: vector<String>,
+        args: vector<vector<u8>>,
+    }
+
+    //TODO define in another module
+    struct ModuleId has store, copy, drop {
+        module_address: address,
+        name: String,
+    }
+
+    struct FunctionId has store, copy, drop {
+        module_id: ModuleId,
+        name: String,
+    }
+    
+    struct FunctionCall has store, copy, drop {
+        functionId: FunctionId,
+        ty_args: vector<String>,
+        args: vector<vector<u8>>,
+    }
+
+    struct ModuleBundle has store, copy, drop {
+        modules: vector<vector<u8>>,
+    }
+
+    struct MoveAction has store, copy, drop {
+        script_call: Option<ScriptCall>,
+        function_call: Option<FunctionCall>,
+        module_bundle: Option<ModuleBundle>,
+    }
+
+    public fun is_script_call(move_action: &MoveAction): bool {
+        option::is_some(&move_action.script_call)
+    }
+
+    public fun into_script_call(move_action: MoveAction): ScriptCall {
+        assert!(is_script_call(&move_action), error::invalid_argument(EInvalidType));
+        option::extract(&mut move_action.script_call)
+    }
+
+    public fun is_function_call(move_action: &MoveAction): bool {
+        option::is_some(&move_action.function_call)
+    }
+
+    public fun into_function_call(move_action: MoveAction): FunctionCall {
+        assert!(is_function_call(&move_action), error::invalid_argument(EInvalidType));
+        option::extract(&mut move_action.function_call)
+    }
+
+    public fun is_module_bundle(move_action: &MoveAction): bool {
+        option::is_some(&move_action.module_bundle)
+    }
+
+    public fun into_module_bundle(move_action: MoveAction): ModuleBundle {
+        assert!(is_module_bundle(&move_action), error::invalid_argument(EInvalidType));
+        option::extract(&mut move_action.module_bundle)
+    }
+
+    /// We provide a native function to decode MoveAction from bytes
+    /// We can not use the `bcs::from_bytes` directly
+    /// because we can not define a `MoveAction` which has same bcs layout with the MoveAction in Rust
+    public native fun decode_move_action(bytes: &vector<u8>): MoveAction;
+}
\ No newline at end of file