In order to realize the system integration of controller，sensors application and execution unit in wind generator operation and maintenance robot, a design method of host computer control interface is proposed. This method mainly solves the problem of system integration between host computer (including control system and control interface in host computer) and lower computer (including vision system，magnetic measurement system and driver system). Meanwhile, according to coordinate value and angle value from the vision system, it is judged that if the actual value meets the requirement of reference value by the background program of control interface in the host computer. Then, it is determined whether the bolts in wind generator are loose or not. The actual value of magnetic flux and stress from the magnetic measurement system is compared with the reference value to determine whether the bolt is damaged. The host computer control interface is developed in the control system to realize the combined control of vision system, magnetic measurement system and driver system. Meanwhile, this system has the function of detecting the damaged or loosen bolts.