Fixed-scale speckles are used in existing ghost imaging system, while the current instrument can achieve multiscale speckles ghost imaging. This paper focuses on the research of compressed sensing ghost imaging system using multi-scale speckles. Through the computer simulation and using the four resolution scales image as the original image, restored images are obtained to analysis on a variety of different scales and different proportion of speckles cases. The results show that the compressed sensing ghost imaging system using multi-scale speckles can get closer to the true value of image. And when the small scale speckles occupy large proportion, the recovered image resolution is not disturbed.