Abstract: The structure and variety rule of natural enemy and insect pest are the base and theory evidence to biological controle pest . Throw random sample at regular intervals, the rustle showed: the arthropod community in Abrus cantoniensis Hance fields contains 10 orders , 25 families , 36 specties .Nezara viridula Linnaeus, Cletus punctiger Dallas, Catantops spp., Oxya Chinensis Thumb and Aphis gossypii Glover are the major insect pests, while Tachys Steph,Chrysopa formosa Brauer,Ieis axyridis(Pallas), Teienomus terbraus Ratzeburg, Vipionidae were the dominant natural enemies; May to early July, early July to early September and the late September to November were respectively the building, the developing and the disintegrating periord of the community;The fastigium of the major insect pests was late June to early July, while the fastigium of the dominant natural enemies was from July to August. During the middle and late growing stage of Abrus cantoniensis Hance,natural enemies steadily occurred,can control insect pests on the whole.