Abstract:Beetle assemblages were investigated by sweep netting in paddy field (Ⅰ), dry land (Ⅱ), natural forest (Ⅲ), and plantation forest (Ⅳ) in lac\|plantation\|farmland ecosystem (LPFE) in Lvchun County, Yunnan Province. A total of 3569 beetles were captured, belonging to 358 species, 21 families. Among those beetles, Curculionidae has most species, comprising 17.0% of the total number, and Coccinellidae has most individuals, comprising 22.9%. For Cicindelidae, Staphylinidae, Meloidae, Nitidulidae, Lathridiidae, Cryptophagidae, Scarabaeidae, Bostrychidae, Hispidae and Scolytidae, the difference between both species and individual in Ⅰ-Ⅳ was not significant, while it was significant for Elateridae, Throscidae, Alleculidae, Lagriidae, Coccinellidae, Cerambycidae, Crioceridae, Chrysomelidae and Curculionidae. The Log\|series model could well fit to the species\|abundance distribution of beetle assemblages in LPFE, Ⅰ, Ⅲ and Ⅳ, and Broken\|stick model could well fit to that in Ⅱ. The diversity at the species level in Ⅰ-Ⅳ was in the order: Ⅲ>Ⅳ>Ⅱ=Ⅰ, while it was Ⅲ>Ⅳ>Ⅱ>Ⅰ, at the family level. If the results from the species\| abundance were considered, it was Ⅲ>Ⅳ>Ⅰ>Ⅱ. It was suggested that the difference between the different land\|use habitats could be indicated by using plant\|inhabiting beetle assemblages. Different kinds of beetle had different role in the indication, the difference between farm\|land and forest could be indicated by Elateridae, Throscidae, etc. The difference between natural forest and plantation forest could be indicated by Alleculidae, Cerambycidae, Chrysomelidae and Curculionidae, and the habitat change could be found through the long time monitor to them. The land\|use in LPFE was different and diverse, and it played an active role in maintaining the beetle diversity. Especially, natural forest was more important for the local biodiversity conservation, while the diversity in dry land was lower, and how to change it during the land utilization, is need to consider for managers.