A method based on Markov model is proposed to calculate the damage probability of anti-radiation weapons to multi-point source decoy system.By analyzing and deducing the calculation method of damage probability of anti-radiation weapons to single point source,meanwhile introducing Markov model and constructing Markov chain,the calculation method of damage probability of anti-radiation weapons to multi-point source decoy system is designed.Furthermore,according to the requirements of mission tasks,the force requirements of anti-radiation weapons can be calculated.The simulation results verify the feasibility of the algorithm.The results also show that the damage probability and force requirement of the anti-radiation weapons for multi-point source decoy system can be well calculated by the method.