Abstract: To study the congestion control of intermediate nodes in the changing network,PID type neural network control scheme for AQM(active queue management) is proposed.Back-propagation algorithm is used to adjust the weights of neural networks and stability of closed-loop system is proved according to the Lyapunov theory.Based on NS-2 simulation platform,the result showed that the proposed control scheme can adapt to the changing network situation,the system steady-state error and transient performance of the proposed scheme is superior to those of PID.