New-type ammunition, as an important part of weapon system, is one of the most important composition factors of army battle effectiveness. How to confirm the question whether the new-type ammunition supports capability can meet the requirements of the rules is a complicated problem. On the basis of analyzing the factors affecting the new-type ammunition support capability, the article constructs an evaluation index system, containing 6 secondary indicators, totally 20 underlying index, such as staff efficiency, storage, transportation, loading and unloading capacity, management efficiency and self-supply ability. The comprehensive index weight is determined based on the gray-fuzzy thought and Analytic Hierarchy Process (AHP), on basis of which the extension evaluation model of the new-type ammunition support capability is further constructed. This model is used to carry out an overall evaluation of the new-type ammunition support capability. The evaluation results show that the model is an effective method of evaluating new-type ammunition support capability, which can be used to guide the support capability construction of the new-type ammunition support unit.