Abstract: By improving the precision of the angle sensor of the original laboratory facility and designing the corresponding computer simulation program, the servo simulation facility of high precision of angle measurement can the constructed. Using the servo simulation facility of high precision of angle measurement, the debugging and measuring of the instrumentation radar servo system's functions and specifications can be achieved in the lab so as to improve the joint adjustment work efficiency. Finally, the results of computer simulation of a phased array instrumentation radar servo system are presented.