Abstract: In order to verify the control eflects of Imidazolinone （IMI） herbicides application to the sunflower broomrape （Orobanche cumana Walln） on Xinshiyihao,which a novel IMI-resistant sunflower variety. 5% Imazethapyr （AS） and 4% Imazamox （AS） were applied at the dosage of 750,1 500,2 250,3 000 mL/hm^2 based on 450 L water/hm^2 at 4-6 leaf stage, 6-8 leaf stage, 8-10 leaf stage of sunflower respectively. According to the parasitism investigation results at 20 clays and 35 days after herbicide application, the sunflower broomrape were well controlled. The best control effect （100%） was achieved in the case of herbicide was applied at the dosage of 750 mL/hm^2 and at the 4-8 leaf stage of sunflower growth, and it is safe to sunflower.