Abstract: For selecting more effective pesticide mixture and reducing the cost of highly effective pesticides, two pesticide mixtures were selected and evaluated in field plots.The results proved the synergism of dipterex + deltamethrin increased the control effect by 10.23-21.42 percentage points, dosage and cost reduced by 0.135 kg/667 m² and 1.02 yuan/667 m² respectively, comparing with single pesticide.The variance analysis showed that the control effect difference between single and mixed pesticides was extremely significant.