Abstract: By investigation to insect communities of the Trifolium repens in the north area in Henan province, the familiar insect categories have been found out which including 12 orders, 37sections, and 80 species; In another word, there are 50 kinds of the harmful pests, 22 kinds of the natural enemy insects, 2 kinds of the activity insects and 1 kind of saprophagous insect. According to the quantity occurred of the pests and the degree of the lawn destroyed, we have known the dominant species of the pest in the lawn. and the reason and dynamic of these species have been analyzed. It is important to the pests management of the Trifolium repens in the level of community.