Abstract: According to the current tendency of anti-submarine warfare formation, we introduce three firing methods of rocket assisted torpedo salvo from a formation of two surface warships, establish three firing models and three salvo interval models of the three firing methods, and calculate the hit probabilities of the firing methods. Simulation results show that the hit probabilities of the three firing methods are all beyond 0.9 when the distance between the formation and the target is less than 38 km, the hit probability of the firing target’s advance position method reaches more than 0. 95 with in the firing range of the torpedo, and the hit probabilities of the firing target’s present position method and the firing target’s probable position method are less than 0.8 if the distance between the formation and target are larger than 46 km and 51 km, respectively.