diff --git a/components/xy_robot_ctrl_module/xy_robot_ctrl_module.hpp b/components/xy_robot_ctrl_module/xy_robot_ctrl_module.hpp
index 5843aea..47bf014 100644
--- a/components/xy_robot_ctrl_module/xy_robot_ctrl_module.hpp
+++ b/components/xy_robot_ctrl_module/xy_robot_ctrl_module.hpp
@@ -90,8 +90,8 @@ class XYRobotCtrlModule : public I_XYRobotCtrlModule, public ZIXYMotor, public Z
   virtual int32_t xymotor_move_by(int32_t dx, int32_t dy, int32_t motor_velocity);
   virtual int32_t xymotor_move_to(int32_t x, int32_t y, int32_t motor_velocity);
   virtual int32_t xymotor_move_to_zero();
-  virtual int32_t xymotor_move_to_zero_and_calculated_shift() { return err::koperation_not_support; }
-  virtual int32_t xymotor_read_pos(int32_t* x, int32_t* y) { return err::koperation_not_support; }
+  virtual int32_t xymotor_move_to_zero_and_calculated_shift();
+  virtual int32_t xymotor_read_pos(int32_t* x, int32_t* y);
 
  private:
   virtual int32_t _module_set_or_get_param(bool set, int32_t param_id, int32_t& param_value);