Abstract: Inhibiting filamentous sludge bulking by using reagent is expensive and easy to recurrence after reagent is stopped adding.In order to solve this problem.This experiment investigate the feasibility of inhibiting filamentous sludge bulking through adjusting process parameters alone by using SBR.The inhibition effect of organic loading rate,dissolved oxygen (DO),feeding pattern and some other common operation parameters on filamentous sludge bulking were investigated systematically.The results show that,it is difficult to inhibit filamentous sludge bulking through increasing organic loading rate alone(>0.40d^-1).However,if aerobic time and aeration rate are not set up properly,viscosity sludge bulking is prone to happen;The effect of inhibiting filamentous sludge bulking through increasing ρ_DO(4-6mg/L) alone is not obvious,meanwhile,excessive aeration could make negative impact on phosphorus removal performance;Although impulse feeding pattern could enhance storage selective function,It makes little effect on inhibiting filamentous sludge bulking;setting up proposed anoxic(anaerobic) phase is an effective method to inhibit filamentous sludge bulking.