In order to calculate the anti-ship mission completion degree of JTF under counter condition, the anti-ship operational effectiveness model of JTF is established on the analysis of the battle procession and system constitute of JTF. According to mission and battle procession, the grade-3 the criteria system is built as “mission efficiency, meta-mission efficiency, weapon performance”. We analyze the sea-detecting effectiveness, command effectiveness and comprehensive strike effectiveness, then we get the model of the way to calculate mission effectiveness. The simulation results show that the model can effectively reflect the effect of combat environment and confrontation to the operational effectiveness, and also has certain theoretical and practical significance.