On the basis of system analysis on the factors, which influence the campaign-level maintenance support ability of self-propelled gun.The evaluation model by using the theory of Delphi method, Fuzzy Analytic Hierarchy Process and variable weight analysis are established. Moreover, this model is confirmed by an example. Through the result, the model is regarded as feasibility and availability. The theoretical base was provided by the model to the maintenance support ability building of self-propelled gun effectively.