The photonic Doppler Vibrometer system has the advantages of high precision, high spatial resolution and fast dynamic response, and is applicable to high temperature, high pressure and high speed. Data processing is an important technical part of PDV system, which aims to obtain the velocity information of the measured motion body from the measurement data containing a lot of noise. In this paper, based on the fringe method, moving mean filtering and wavelet transform are respectively adopted to deal with the original signal de-noising, singular points and other problems, so as to obtain the vibration information of the measured object. The reliability and universality of the data processing method are verified by comparing the vibration test with the standard laser vibrometer.