In order to select effective single and mixed pesticides for the control of Aphis citricola van der Goot,toxicity of acetamiprid,imidacloprid,beta-cypermethrin,bifenthrin,abamectin,fenvalerate,phoxim,malathion and their mixtures were tested by insect-soaking method.The results showed that A.citricola was sensitive to acetamiprid,followed by imidacloprid,bifenthrin and abamectin.The toxicity of malathion was the lowest.Among all formula,the synergistic effect of the mixture of acetamiprid and abamectin at the proportion of 2∶1 was the best,the second was acetamiprid and beta-cypermethrin at the proportion of 1 ∶4,followed by acetamiprid and abamectin at the proportion of 1 ∶ 4 and 4 ∶ 1,acetamiprid and fenvalerate at the proportion of 1∶ 4,acetamiprid and bifenthrin at the proportion of 1∶ 2.Field experiments also indicated that control efficiency of the mixture of acetamiprid and abamectin at the proportion of 2∶1 on A.citricola was better than that of their each single.