The ability of the ship is one of the important support of formation combat ability, and the previous literature rarely involves the assessment of the ability of formation motor combat ability. Through the analysis of the concept of the motor warfare of the ship formation, the key factors of the ability of the mobile combat capability are resolved, and the system of the multi-layer evaluation index is constructed, and the ability of the formation to be described by the analytic method is described. In view of the difference of the parameter parameters, the difference between the actual value and the expected value of the different indexes of the utility function is used, and the utility evaluation model is established, the ability of the ship formation is evaluated accurately, and the feasibility of the validation function model is analyzed by an example.