For special requests of eliminatng noise in wrapped phase field, a vector filtering method of wrapped phase field pretreatment is proposed. Power spectral density and the filtering behavior of vector transformation are analyzed theoretically. Through simulation, the size of the filter template affecting on filtering imaging is investigated, the filtering effects of second mean filtering method and vector filtering method at the same size of filter template is comparised, the curve distribution of power spectral density of second mean filtering method and vector filtering method is analyzed. It shows the phase image filtered by vector filtering method which can decrease noise is still clean, the distribution of power spectral density has no change, the spectral information loss after pretreatment though vector filtering was smaller than second mean filtering. The vector filtering method improves signal-to-noise ratio, furthermore the information integrity still obtains a better guarantee at the same time.