During the development of an aircraft,the software of Stores Management System (SMS) often requires redevelopment and upgrading maintenance due to the constantly changing of needed weapons.To solve the problem,the concept of plug-and-play was brought out.We hope to apply the plug-in technology to SMS and thus to realize the integration of new weapons with no or just a little modification to the main program.In this paper,an introduction is made to the basic principles of the plug-in technology and its realization method.Then,several key technologies for using the plug-in technology in SMS are summarized according to the composition and functions of SMS.In addition,the solutions of key technologies are presented,such as the function partitioning of weapon-integration platform and plug-ins,the design of plug-in interface,invoking process of plug-ins etc.A demonstration platform is built up to verify the effectiveness of our method.