Abstract. At present, there are four typical integrated models of RFID and WSN, which have some advantages while they have been integrated. To solve these problems, an optimized model is proposed, and a new dynamic RFID-WSN integrated system is designed based on the optimized strategies. The system is composed of a new integrated node, which is designed based on WSN network model and RFID protocol and can dynamically switch roles between WSN node, RFID reader and RFID tags. Through the design of dynamic construction mechanism to organize and manage these integrated nodes, the system realizes dynamic switching and adaptive construction between RFID and WSN. The new integrated system solves the problems existing in the four typical models and has better characteristics and more flexible applications.