Abstract: In order to understand the influence of land use types on the quantity and seasonal dynamic pattern of Ichneumonidae insects in southwest mountainous areas, the Malays net was used to collect the Ichneumonidae insects in natural forest, artificial forest and farmland month by month in the area of 2000-2300m above sea level in Cangshan mountain, Dali Bai Autonomous Prefecture, Yunnan province. The results showed that there was little difference in the number of groups within each land use type, but there were significant differences in the abundance, community structure, dominant taxa and seasonal dynamics. Neither the monthly mean temperature nor monthly rainfall can explained the monthly difference of the individual number of Ichneumonidae insects. Land use change had significantly affected the community of Ichneumonidae insects, but the mechanism needs further study.