Improvemnet of imaging resolution is a hot topic, it plays the important role in modern war. The relation of pixel gray-level of low resolution images and high resolution image is found based on charge coupled device (CCD) imaging theory, and a new approach for improvement of CCD imaging resolution is proposed. A high resolution image is obtained by moving multi-shift images with low resolution, the objective of improvement of CCD resolution for many times is attained. Making the indeterminate equation into unique-value equation is the essence of this approach.The simulation examples show that the approach for improvemnet of CCD imaging resolution is right, resolution can be improved 2 times, 3 times and even N times in theory. In addition, operation time is lower than other methods.