Route planning of anti-ship missile in coordinated attacking is one of the specific problems of route planning. The special requirements of anti-ship missile for route planning in coordinated attacking are analyzed, and the constraints of the anti-ship missile itself on route planning are discussed. Considering the above characteristics, a sort of rapid method for anti-ship missile route planning is put forward based on geometric principle. The route planning method is presented here, and simulation results have proved that the proposed method is efficient for route planning of anti-ship missile in coordinated attacking.