Abstract: In order to effectively control annual grass weeds of rice fields in Fujian,three herbicides with different concentrations,including 1% oxaziclomefone suspending agent,10% bispyribac-sodium suspension and 20%Cyhalofop-butyl oil suspension,were selected to control grass weeds,such as Echinochloa crusgalli(L.)Beauv.,Leptochloa chinensis(Linn.)Nees in Youyang township of Xianyou,Putian city.The results showed that:20%Cyhalofop-butyl oil suspension is the best herbicide in direct seeding paddy fields to control grass weeds and the control effect was above 80% after 30d-treatment.The recommended concentrations of the herbicide ranged from45g·hm-2 to 105 g·hm-2(active ingredient)with the water 675 L·hm-2.Under the recommended concentrations,the herbicide is safe to rice.