Abstract: The system-level multi-radius test for the microwave radar is a ground environmental simulation test to verify the reflection disturbance to microwave signals from the surface and the blocking of two flight vehicles during their rendezvous. Its purpose is to validate the function of the laser radar system and its installation position. The test is carried out 20 meters away from the object vehicle, to measure precisely the angle and the distance of the microwave radar antenna and the microwave response antenna. According to the test environment and the measurement items, and by comparing different alignment schemes, the method of directly measuring the equipment structure's very benchmark is proposed, which can provide correct reference data for improving the fix position of the microwave radar outside the orbit module of the spaceship, thus guarantee the precise measurement of the microwave system in China's first space rendezvous mission.