Abstract: 【Objective】 In the new situation of the forage Lygus pratensis (linnaeus) acting again as the major cotton pest in the cotton areas of southern Xinjiang, clarifying the host plant species of forage bugs and seasonal succession host feeding in the cotton area of southern Xinjiang can provide a theoretical basis for the prevention and control it. 【Methods】 The host plant species of L. pratensis were investigated in the main cotton planting ecological areas in southern Xinjiang from 2015 to 2017. 【Results】 The host plants of L. pratensis belonged to 26 families, 90 genera and 118 species, mainly concentrating in Leguminosae, Compositae, Chenopodiaceae, Brassicaceae, etc. Among them, 50 species were cultivated crops (including horticultural crops), 54 species were weeds, 8 species were landscape flowers and 6 species were trees. The annual life cycle of L. pratensis developed according to the species of host plants in different seasons. 【Conclusion】 There are a wide range of host plants of L. pratensis in southern Xinjiang, and feeding hosts showed obvious seasonal succession, which provides a good condition for its seasonal migration. Comparison and analysis with reports from the 1950s to the 1960s show that over time, the introduction of cultivated crops, fruit trees, and landscape flowers and so on is the main reason of L. pratensis.