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For the characteristics of complex spacecraft electrical system, that is complex functional interface and many types of signals, the objective reasons such as redundancy of interface, complexity of temporal logic and multiple grounding types are analyzed systematically. The working procedure of sneak path analysis for complex spacecraft electrical system is defined , the single channel electrical interface data collection, circuit schematic design and simplification methods and key points in the preparation of sneak path analysis are briefly discussed , combined with the simulation analysis and optimization method of sneak path, the potential path search, analysis, identification and verification of potential path fault location of complex spacecraft electrical system are summarized. Four design principles for the prevention of sneak path in complex spacecraft electrical system are presented , that is simplified electrical interface, signal type, isolated electrical interface, single signal flow and planned ground design , the reasons for the hidden path problems in the matching test of the spacecraft and the improvement measures are analyzed.