The study on the Rhizoma cyperi(Cyperus rotundus L.) in Manilagrass turfgrass with two sulfonylureas herbicide showed that the control effect of 25% flazasulfuron was 84.8% at the dosage of 5 g per 667 m2,and reached 98.8% at the dosage of 20 g per 667 m2.The control effect of 75% Trifloxysulfuron was 90.7% at the dosage of 2 g per 667 m2,and reached 100% at the dosage of 8 g per 667 m2.The control effect of 56% MCPA-Na was 49.4% at the dosage of 100 g per 667 m2.