Fourier transform-based spectral analysis has some limitations, which is a global transformation, and wavelet has good time-frequency resolution. By combined the Hilbert transform with wavelet analysis methods, the gearbox's pitting failure was studied. By using the JZQ250 gear pitting failure as analysis object, the measured vibration acceleration signal was used to do wavelet transform and Hilbert transform. For a better human-computer interaction, using the powerful interface development capabilities of VC ++ to embed it, analyzing the data was realized, and a rule base was designed. The results show that the interface designed is feasible, and can effectively diagnose fault.