Abstract: 8 different component pesticides were tested against Brontispa longissima (Gestro) in field, by using improved Zhitong sprayers. The results showed that acetaniprid, imidacloprid, Beta-cypermethrin, fenpropathrin, carbosulfan, abamectin, quinalphos and fipronil continued to maintain the same good control effect as indoor. The mortality and control effect are all over 99% after 7d,15d and 30d respectively, a small number of trees were infected coconut leaf beetle again after 90d and 120d respectively, most trees were found eggs and pupas after 150d , and the control effect had a slight decline, but will not cause a substantive impact on growth of center coconut leaves.