Abstract: The occurrence of weeds in sunflower field brings severe yield loss and quality deterioration to sunflower seeds product. In practice, artificial weeding need more labor and higher cost, and there is no suitable foliar-applied herbicide for annual weeds in sunflower fields. In 2007, we introduced an herbicide resistant sunflower hybrid--Jaguar, and used 4.8%Imazamox-Imazethapyr（AS） as foliar-applied herbicide on it. In this study, the test herbicide was sprayed at the dosage between 66.7 m L/667m2 and 200 m L/667m2.Results showed that the control efficacies of test herbicide were from 88.1% to99.9% 40 days after spraying. When applying dosage were 83.3 m L/667m2 and 100 m L/667m2, it kept effective and safe to sunflower.