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With the structure characteristic of helicopter main reducer,the vibration signal of it has often low signal-to-noise ratio,which makes it difficult to extract fault feature. In this paper,based on a certain type of helicopter`s main reducer as the research object,carried out the Time Synchronous Averaging(TSA) technology in application of in-depth study on the main reducer fault feature extraction,. and analyzed the application of this technology in the practical and the error affect ,on the basis of this puts forward the improved method of TSA`s error analysis. The method is proved to be effective in application of based on the analysis of flight data of helicopter main reducer,and can improve the accuracy of fault feature extraction partly.