Abstract: The toxicity of 10pesticides and field control efficacy of 4systemic pesticides to Diaphorina citri were tested with dipping and root pouring respectively for effectively controlling the citrus psylla.The result of indoor determination showed that, after 24htreatment, the toxicity of pesticides against Diaphorina citri in LC50 of lambda-cyhalothrin and decamethrin was 2.116and 3.030 mg·L-1, respectively, which were higher than it of Pymetrozine, spirotetramat and Imidacloprid.The lowest toxicity was pymetrozine with LC50 2 025.489mg·L-1. Though the effect of 4systemic pesticides controlling citrus psylla in the field was low in short term with root pouring treatment, the control effects of 10% nitenpyram AS 2 000times、70%imidacloprid WG 14 000times and 7 000times were maintained at 87%during the 14-28dof the treatment and even reached higher than 97%28days after treatments.