Abstract: The arthropod community of transgenic 741 poplar was analyzed from three aspects of community structure, temporal structure and nutritional structure.The results show that:on compositive structure,main compositive groups of the community structure were Coleoptera、LepidopteraAraneae,Homoptera and Hymenoptera in Pb29 and CK; On nutrition strcture, function groups on every nutrition level were similar between Pb29 and CK,but in Pb29 leaf-eating pest on bascal species largely decreased,the rate of intermediate species increase,top species have no obviously changing;on temporal structure, numbers of individual and species of Lepidoptera in Pb29 and CK has similarly changing tendency,function groups and every nutritionalasses with individual numbers and species,there have similarly changing tendency.