A method using adaptive-network-based fuzzy inference, system (ANFIS) to build conversed dynamic model of controlled system is introduced. The input of ANFIS is output and state of controlled system and its, output is input of controlled system. The parameters of the ANFIS are identified by the hybrid algorithm, which combines BP algorithm with LSE. Finally, an conversed dynamic model is built and applied to the simulation of the system. Compared the result of the simulation with that of tradition BP network model, it proved the effectiveness of the method.