In order to improve the scientificity of the division of supervision scope and acceptance scope of equipment accessory products, an improved risk priority number evaluation model suitable for evaluating the quality risk of accessory products is established, the evaluation criteria of the influencing factors in the model are given, and the method for obtaining the weight factors of the influencing factors is studied. Taking armored equipment as an example, the risk priority number of typical supporting products and typical quality characteristics is calculated, and the adjustment suggestions of supervision scope and acceptance content of supporting products are listed. The results show that this method can provide a reference for the military to carry out the supervision of large and complex weapons and equipment.