Easy, Security and efficient methods were studied in this paper to controlling the sedge in rice field effectively. The results showed:the dosage of Harrier 70.5%DF arrange 30～50 g per mu are good to controlling the sedge, the dosage of Harrier 70.5% DF 25 g per mu cooperated with that of Weinong 30% WP 6.7 g per mu as good as the dosage of F7967 25%WG 6.7 g per mu cooperated with that of MCPA 56% 47.6 g or Weinong 30% WP 8.9 g, the same as the dosage of Kuaimieling 40% DF 4.2 g cooperated with that of Weinong 6.7 g, are all good to controlling the sedge, but there are slight damage to the crop, and it is need some time for rice to recover.