Abstract: Two typical services of DiffServ network are analyzed and controlled, i.e., the premium and assured traffic services. Based on the theory of nonlinear fluid flow, a DiffServ network model was developed to design a new adaptive sliding mode controller. The model was transformed into the form where all parameters are feedback strictly. Then, the backstepping procedure was employed to complete the design. The adaptive backstepping sliding mode controller designed in this way has an ideal regulation effect of buffer queue length on unknown system dynamics and uncertain disturbances and constricts them. In such an ideal sliding mode, the asymptotic stability is available. The effectiveness of the control scheme was verified by simulation results.