When the frame transfer CCD image sensor shooting starsky background image,the smear phenomenon caused by high brightness stars in the field of view will seriously affect the target detection.For removing the smear phenomenon,a smear removal algorithm based on wavelet transform in starsky image was proposed.According to the mechanism of smear and characteristics of the starsky image,the model of smear problem was established,the smear line was separated into the high frequency components and vertical components by using multilayer twodimension haar wavelet transform,and the smearremoved image was reconstructed.The expirmental results show that the method can effectively remove smear and retain original image information,and enhance the SNR of small target in smear area.