Abstract  [Objectives]  To investigate the effectiveness of four insecticides on Clanis bilineata larvae in the field. [Methods]  Four commonly used insecticides; Dichlorvos, Chlorfenapyr, Lambda-cyhalothrin and Imidacloprid, were tested on C. bilineata eggs and 1st to 5th instar larvae, in accordance with the manufacturer’s instructions. The hatch rate of eggs, rate of population decline, and the corrected control effect on larvae after 1, 3 and 7 days, were measured and compared. [Results]  The hatchability of eggs treated with Imidacloprid, Chlorfenapyr, Dichlorvos or Lambda-cyhalothrin, was 61.11%, 57.78%, 15.56% and 2.22%, respectively. Eggs treated with Lambda-cyhalothrin had a significantly lower hatch rate than those treated with the other pesticides (P< 0.05). After 7 days, the control effect on 1st instar larvae treated with Lambda-cyhalothrin, Dichlorvos, Chlorfenapyr or Imidacloprid was 100%, 99.76%, 93.81% and 65.48%, respectively, that on 2^nd instar larvae was 99.05%, 90.31%, 82.03% and 50.59%, respectively, that on 3^rd instar larvae was 98.00%, 71.59%, 64.22% and 35.11%, respectively, that on , 4th instar larvae was 95.71%, 78.53%, 71.37% and 38.24%, respectively, and that on 5th instar larvae was 94.21%, 55.69%, 55.29% and 41.12%, respectively. [Conclusion] Lambda-cyhalothrin was the most effective of the four insecticides tested on eggs and larvae and imidacloprid was the least effective. These results provide an important reference for C. bilineata control.