Wavelet transform is an important tool for image procession. The nonuniformity correction(NUC) is one of the key techniques in staring focal plane array imaging system. Based on the analysis of NUC of infrared focal plane array(IRFPA) by temporal highpass filter, the wavelet transform is used for the design of digital lowpass filter, which applies Mallat pyramidal algorithm to improve the frequency resolution of low frequency. The method is adaptive, which can efficiently overcome ghosting with proper scale. Its efficiency and surperiority are clarified by simulation.