In order to solve the problem that is mismatching between the function of the gun & ammunition cabinet and the forces mission attribute, it was systematically analyzed the functional requirements of the gun & ammunition cabinet, and carried out reasonable function design on the basis of the scientific analysis. Use the KJ method to obtain 32 functional requirements of the gun & ammunition cabinet, establish a KANO model, conduct the positive-negative questionnaires for 32 functional requirements obtained, and calculate the better-worse coefficient of each functional requirement item by data statistics and analysis. Among the 32 functional requirements, 13 basic requirements, 6 expected requirements, 11 exciting requirements and 2 indifferent requirements were obtained, and the requirements were sorted and applied to the design. It clarified the functional requirements of the gun & ammunition cabinet at the current stage, and proposed the corresponding design scheme. The functional requirements greatly matched to the force mission attribute and improved the support capability of our equipment.