By analyzing the optical characteristic of the off-axis and multi-pass amplified high power solidstate laser facility,using the theory of binary tree tracing and matrix optics,and dividing the system into four parts that include cavity amplification part,boost amplification part,beam reverser and beam output part,the ghost image are analyzed and traced. Main of ghost image that are devastating are given in all parts. By comparing the analysis of ghost image with the phenomena in experiments,the analyzing means is proved feasible and dependable. The work provide basis for avoidance of ghost image damage in the latter experiments and the similar facilities.