Abstract: 【Objective】The tests were conducted to evaluate the synergistic effects of four kinds of additives, namely, organosilicon, mixed orange essential oil, green peel orange oil and Jijian, on field control efficacy of acetamiprid against Bemisia tabaci, and to evaluate the decrement effects of 3000-fold dilution of organosilicon on field control efficacy of acetamiprid against B. tabaci. 【Method】 The field efficacy trials were conducted by spraying .The recommended dose of 5% acetamiprid EC was mixed with organosilicon 3000-fold dilution, orange essential oil 1000-fold dilution, green peel orange oil 1000-fold dilution and Jijian 3000-fold dilution, respectively, to determine the control efficacy of droplets density and coverage rate of acetamiprid on B. tabaci and the decrement effects of 3000-fold dilution of organosilicon on field control efficacy of acetamiprid against B. tabaci.【Result】The results showed that the recommended dose of 5% acetamiprid EC mixed with additives could increase the droplets of the liquid. However, the recommended dose of 5% acetamiprid EC mixed with different additives showed different control effects to B. tabaci. Among the tested additives, the organosilicon had obvious synergistic effect and long persistent on acetamiprid against B. tabaci, followed by green peel orange oil, and there was no significant difference between the mixed solution of orange essential oil and acetamiprid EC and branch water. 5% acetamiprid EC mixed with organosilicon could improve the control effect of B. tabaci, and reduce the application amount of 10%-40%.【Conclusion】5% acetamiprid EC mixed with organosilicon 3000-fold dilution can be used for the prevention and control of B. tabaci in practice.