On the analysis of the typical combating scenario for the cooperative air defense and anti-missile system of ship formation,research the operational process of the system based on the (observe,orient,decide,act) OODA theory.Then,the combat mission section and function demands are given.The operational effectiveness evaluation index system of cooperative air defense and antimissile system of ship formation is studied.The evaluation model of operational effectiveness,both individual and stage effectiveness for ship formation cooperative air defense and antimissile system were proposed by combing the analytic hierarchy process (AHP) and index method.An example was given to verify the feasibility of the method,which can provide technical support for operational effectiveness evaluation of the ship formation in cooperative air defense and antimissile system.