It is an effective approach to improve CCD imaging resolution by micro-displacing CCD and reconstructing image in a computer. Based on this method,an assortment was proposed to differentiate CCDs by the relationship between pixel size and light-insensitive interval size. If the intervals are neglected,as usual,the quality of the reconstructed high-resolution image using the micro-displacing technology will be reduced,and some information of the original object might be lost. An algorithm which is available for more sorts of CCD is proposed to reconstruct high-resolution image,and the limitation of this approach is also educed. The simulation and experiment result show that the quality of the reconstructed image can be effectively improved.