Abstract: Due to the complexity and dynamic characteristics of computer network,traditional control theory is difficult to apply to the algorithm design and analysis of AQM(Active Queue Management).In this paper,an AQM algorithm named CF(Combination Fuzzy control) is presented,which is based on fuzzy sets and fuzzy system theory.Fuzzy controller I computes the control value based on the instantaneous queue length and the derivation of queue length,and fuzzy controller II computes the control gain based on the queue load factor. Proper choice of fuzzy controller parameters endows the fuzzy control system with the same local stability as the PI control system.Simulations are made to verifiy the presented algorithm and to compare the performances of CF,PI(Proportional-Integral) and single fuzzy controllers.