The CCD imaging sensor has the inherent characteristics of frame transfer. When bright stars appear in theCCD sensor, a bright line will be produced in its row or column. Smear phenomenon changes the nature of the coverage area of the image, so it must be removed. On the analysis of the mechanism of the Smear, a Smear removal algorithm is proposed, which can remove the bright lines and reserve dim targets. According to local histogram Gaussian fitting, the image background parameters are estimated, and the median filter and the multi-threshold are used to reserve the dim targets. In order to improve the visual quality, a sub-sampling method and a 4-neighbour domain filter are proposed. Experiment verifies the effectiveness of the method.