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In order to diagnose gear fault accurately, a new fault diagnosis method is proposed based on EMD and difference envelope spectrum of pure frequency modulation signal. Firstly, the empirical mode decomposition is used to decompose the gear vibration signal to obtain several components; secondly, according to the kurtosis of the maximum kurtosis value and its adjacent components, the effective components are synthesized; Next, the empirical AM-FM decomposition is used to obtain the pure FM signal; Then, the empirical AM-FM decomposition and Fourier transform are used to obtain the difference of pure FM signal Finally, fault diagnosis is carried out by the difference envelope spectrum of pure frequency modulation signal. The validity of the method is verified by processing the vibration signal of gear broken.