Collecting insects in peanut field of Jilin Siping in China by Malay net from May to Sep. of 2014, 2015 and 2017. The diversity and dynamics of insect species were analysed in this region by morphological classification identification method with DNA barcoding. The results showed that 20 943 insects were collected totally, belonging to 217 species. The main insects of Coleoptera are Monolepta hieroglyphica（Motschulsky） and Harmonia axyridis（Pallas）. The main insects of Hemipterain are Jacobiasca formosana and Orius sauteri. The main insects of Diptera are Cophinopoda chinensis Fabricius and Cuphocera varia Fabricius. The main insect of Hymenoptera is Apanteles derogatae Watanabe. The main insect of Lepidoptera is Celypha flavipalpanus（Herrich-Schaffer）. The dominant specie was Frankliniella occidentalis Pergande in Thysanopera. The dominant specie was Chrysopa phyllochroma Wesmael in Neuroptera. According to the comprehensive data of three years, the insect community diversity index of peanut field in Siping is relatively high, the community structure is relatively stable, the variation trend of the uniformity index is basically consistent with the diversity index, and the variation trend of the dominance concentration index is just opposite to that of the diversity index and the uniformity index.