With the severer and severer market competition, more and more enterprises pay attention to informatization construction, and even some domestic small and middle enterprises (SME) also take the management of suppliers and customers into their informatization construction system. However, when enhancing exterior informatization construction, enterprises always ignore their inventory management and optimization measure. Therefore, the paper analyzed in detail inventory management of SME, and put forward five kinds of optimization schemes of value-added network based on Internet, which will be helpful for enterprises to participate in international competition.