Based on the previous analysis of spatial distribution of the ghost images in high-power laser system, interference among the ghost image beams reflected by front edge and the trailing edge of the pulse which overlapped together were further considered. According to the Shenguang (SG)Ⅱ facility, the maximal focal length of minimal aberration lens which induced ghost images interference were calculated corresponding to the different laser pulse width range from 3 to 10 ns. Several situations of the interferences existing with the ghost images were simply simulated with incident plane wave. The results indicate that high density modulations existed on the focal plane of ghost images which greatly enhanced the peak power of the ghost images. Near the ghost focal plane, there were also dramatically spatial interference modulations which increased ghost beam power greatly especially for the higher order ghost images, which should be emphasized greatly in practice.