A flight controller structure based on RBF NN was designed,and its control law and tunned law for RBF NN parameters.(center and width of gauss function, weight) were presented. F8 Fight aircraft was taken as the control object and a simulation was thus performed. The results from simulation show that, even under 70% model error, this controller manifests excellent control performance and good robustness. Fully-tunned law presented in this paper is better than the conventional algorithm which only adjusts weight value of RBF NN.