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This paper uses FTA (Fault Tree Analysis) with FMEA (Fault Mode Effect and Analysis) to do the study on reliability of low voltage apparatus. Establishing the fault tree is the most important step in using fault tree analysis. The validity of the tree model will have a great impact on the study result. The combination of the two analysis method can give a full-scale and detailed analysis of the product. Let FMEA get the product's fault mode and fault effect, and use Fault Tree Analysis method to build the fault tree and carry out qualitative analysis and quantitative analysis. The study result gives both theoretical and practical advices on improving the product's stability.