With the development of intelligent information technology,the fuzzy neural network(FNN)algorithm is widely used in the industrial control application.At present,the application,which the FNN is used in the PLC,is still a blank.In view of this status,this design of FNN based on S7-200 PLC is given.The design uses FNN,programs with the ladder and instruction sheet in the S7-200,and simulates the process in the simulation software.The result achieves the expectation.