Composition of arthropod species on Kudzu, Pueraria lobata and the population dynamics of five main phytophagous insect groups were analyzed. It showed that 212 species of arthropods on Pueraria lobata, from 87 families belonging to 15 orders were collected and identified, and 138 species of them, which are from 43 families, feeding on Pueraria lobata. There were a regulatory population dynamics of five phytophagous insect groups, small bean bug Chauliops fallax, sieve pore bug Megacopta cribraria, Megacopta spp., leafbeetles and planthoppers. Three peaks of population dynamic of C. fallax were found in the year. The first peak occurred in middle and late April, the second one occurred in late June to early July and the third one occurred in early and middle September while the low level of population in middle and late November to next February was observed. Three peaks of population of M. crabraria were found in middle May, late June and September, respectively. Two peaks of leafbeetles population and four peaks of Megacopta spp. and planthoppers population were observed. On the other hand, the results of analysis on populations showed that the level of population in the first half year was higher than that in the second half year, and that Chauliops fallax and planthoppers were more important than others species.