This paper proposes and implements a solution of software structure in mobile communication based on wait-stop protocol and plugin management. In Window Mobile environment, the solution takes advantage of object-orientation, callback function and multi-thread technologies. It implements and packs network communication interface based on wait-stop protocol. In addition, by proposing plugin manager for new business' extension, this paper proposes a more complete basic software structure, especially by adding new business to the structure. Experiments show that the solution is effective in instant messenger and streaming business.