Laser decoy jamming equipment lacks reasonable and feasible jamming effect evaluation method in actual combat training.According to the three main problems that laser decoy jamming effect evaluation method needs to solve, that is, corresponding jamming effect evaluation criteria, suitable object to be jammed and feasible jamming effect experiment method, the jamming effect evaluation criteria of deflection angle is proposed.The laser semi-active guided missile simulation system with the laser seeker simulator as the core is determined as the object to be jammed, and the ground simulation jamming effect experiment is improved.Finally, the feasibility of the improved ground simulation evaluation method based on the evaluation criteria of deflection angle is verified through experiments.