Abstract: True bug communities were investigated by sweep netting in paddy field(Ⅰ),dry land(Ⅱ),natural lac forest(Ⅲ),and lac plantation(Ⅳ) in lac plantation-farmland ecosystem in Lvchun County,Yunnan Province.Atotal of 1583 bugs were captured,belonging to 79 species,54 genena,and 11 families.In the 4 plots,the first dominant species were Leptocorisa acuta,Eysarcoris guttiger,Velinus annulatus,Dysdercus poecilus.The four species richness Swere 19.250,17.750,23.333,19.333,the Shannon-Wiener index were 1.951,2.081,2.552,2.511,the Simpson index were 0.229,0.214,0.125,0.113,and the Pielou index were 0.668,0.738,0.810,0.848 respectively.The order of diversity of the bug communities was ⅢⅣIIⅠ.The diversity of bug communities in the complex system was moderate,and the different land use habitats in the system had different species component and diversity,which was associated with the different land use patterns and intensities.