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In the integrated test process of rendezvous and docking spacecraft, in order to achieve the cooperative work of multiple spacecraft, it is necessary to simulate the flight state and sequence of the spacecraft in the process of rendezvous and docking in real time, which puts forward high requirements for the coordination and matching between the spacecraft and the test system, especially for the system time benchmark accuracy. The ground test equipment needs to have a unified and high-precision time standard. As a reference of test data and test instructions, it is the key to accurately measure the shipborne frequency standard. In the process of comprehensive test of the whole ship, the time benchmark and the basic time correction method are studied, and the key technology and method of time accuracy synchronization algorithm are adopted to ensure the accuracy and accuracy of time Causative. Through practical application of high-precision time precision method and system design, it can meet the application of rendezvous and docking manned spacecraft engineering, ensure that the function and precision of precision time reference system can meet the test requirements, and provide a very important auxiliary means for the reliability verification of manned spacecraft.