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This paper mainly discusses the theoretical foundation for composition, function and fault tree analysis of urban rail transit vehicleSpower supply. On the basis of analyzing the function of vehicle power supply, aiming at the incompleteness of vehicle power supply, the fault tree analysis that use for analyzing and researching the reliability of vehicle power supply is proposed. Through building power fail fault tree, the fault that cause power fail is analyzed qualitatively and quantitatively. All fault combination that lead to urban rail transit vehicle power supply fail are found by qualitative analysis, while fail types that easy cause vehicle power supply fail found by quantitative analysis. Combining the results get from qualitative and quantitative analysis, this paper opens a new SapproachSto calculate urban rail transit vehicle power supply reliably, and puts forward corresponding suggestions to effectively improve reliable vehicle signal power supply, further to provide scientific basis for maintenance and detection of vehicle power supply.