Abstract: A congestion control algorithm based on node-congestion and link-congestion was presented with sliding mode variable. Min-data package of node outgoing traffic was preferentially transmitted in the link-congestion; and active queue management method was used for the congestion control of the node level. The controller implements the purpose that congestion control can be simultaneously carried in MAC layer and transport layer. It can adaptively adjust the data sending rate according to the local congestion status of the network nodes, and the MAC channels are adaptively allocated. The validity of the proposed algorithm was proved by the Lyapunov function. Simulation results indicate that the algorithm restrains the congestion in the wireless sensor network, and reduces significantly the queuing time.