Weapons capability categorization system for the stakeholders involved in a large number of features, put forward a new method of capability categorization of weapons equipment system based on association rules. Introduce the basic concepts of association rules, after preprocessing the weapons equipment system capability, use the FP-Growth algorithm to mine the association rules, and filtrated the association rules. Then, based on complete ability categorization, test the proposed method by programming. The experimental results show that the method can achieve the automatic categorization of capabilities and has better accuracy and recalling rate.