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The traditional sneak circuit analysis were full of manual operations, low efficiency, and there were problems such as long analysis cycle, low automation level and high error rate. The sneak circuit analysis method based on Mentor Graphics' CHS (Capital Harness System) software was proposing, which could perform sneak circuit traversal and analysis automatically simply by following the simulation steps to build electrical component models and construct functional constraints. Compared to traditional sneak circuit analysis, this method could not only reduce the repetitive operations, but had obvious advantages in reducing system complexity, improving the accuracy of system analysis results, and enhancing the standardization and consistency of data management. The validity and feasibility of the method has been confirmed experimentally in the power distribution diagram of a launch vehicle by using CHS software. Key words：CHS; electrical component model; functional constraints; sneak circuit analysis