Abstract: Based on the difficulty of coverage caused by traversing the in orbit flight status in the system level electrical test of the Chang’e 5 lunar probe, and the high requirements for flight simulation and robustness test caused by multiple mission profiles and critical processes, the technology of state traversal and incremental integration test method is proposed and applied for the first time. The system level electrical test is designed by means of multi layer validation strategy based on states, phases and profiles division. The overall solution, which contains basic startup, incremental stack, and integration step by step, is designed and applied. By this method, the system level electrical test is carried out as early as possible and as faithful as possible, and the deconstruction of composition complexity is achieved. Meanwhile the interactions among multiple spacecraft, and the coupling of different subsystems are checked in the process of the system level electrical test. Based on the non intrusive load monitoring, the high fidelity data is acquired for the critical operations under specific mission profiles and in system level tests. The characteristics of China’s spacecraft technology are reflected in the left shift strategy of test and evaluation in the Chang’e 5 development process compared to the Apollo Project.

Key words: Chang ’e 5 lunar probe, Electrical test, Validation strategy, Mission profile