Considering the requirement of high performance of induction motor servo drive system, a sliding mode controller of induction motor drive system was developed based on fuzzy neural network. As the control system was in a state of hyper-plane sliding, the index of sliding mode control fluttering was investigated and input into the learning algorithm. Subsequently, the output of fuzzy neural network would be adjusted to reduce the fluttering. The analysis and the proposed method were verified by simulation and experiment. The results show that the simulation results agree well with the test results, the fluttering is reduced evidently, and the design of the sliding mode controller is rational. 