Based on the investigation of pests and natural enemies in poplar stand within a vear,the composition and the dynamics of pests and natural enemies were analyzed. The results showed that there were 36 species of insect pests belonging to 22 families and 22 species of natural enemies belonging to 16 families. The important groups of insect pests were Notodontidae, Halticidae, Tingidae, Gryllidae and Limacodidae, while the important groups of natural enemies were Braconidae, Chrysopidae, Tachinidae, Micryphatidae and Tetragnathidae. The dynamics of species richness of insect pests and natural enemies showed the same tendency, that was low-high, then lowhigh-low. The dynamics of diversity index of insect pests and natural enemies were also the same tendency. The relations of natural enemies following insect pests were obviously. BR Nutrition. Diet. Prey. Parasites diseases and disorders. Parasites. Hosts. Ecology. Predators. Habitat. Terrestrial habitat. Land zones. Palaearctic region. Eurasia. Asia. China. Insecta (Arthropoda): Predator, Host, Parasite, Prey; Araneae (Arachnida): Predator. Araneae: Insect prey, Pest and natural enemy community, poplar stands, Anhui; Insecta: Food plants, Poplar, pests and natural enemies, Insect prey, Pest and natural enemy community, Insect parasites, poplar strands, Insect hosts, Plant hosts, Community structure, Population dynamics, Arachnid predators, Araneae, Insect predators, Forest and woodland, Poplar stands, Anhui, Hefei. ST Animalia, Arthropoda, Arachnida. Arachnids; Arthropods; Chelicerates; Insects; Invertebrates. noneEmail20150409 dyz510@ahau.edu.cn