Abstract: This paper deals with the study on the compositions of grasshopper species of different habitats in Xilin River District, Inner Mongolia Autonomous Region, China. 21 species of grasshoppers are got in the 8 sample sites (5 habitat forms) . The compositions of grasshopper species vary among these habitats. Grasshopper species are plentiest in the sanddune (sand belt) which locates at the north bank of Xilin River, about 40kin long and 10km wide. Species living in the typical steppe can live in the sand dune, but some species only live in the sand dune. Sand dune in the region is the "reservoir of grasshoppers" for typical steppe. The commonness species, also dominant species, are euryhabitat selection species, and they are important pests to pasture grasses.

Key words: Xilin River District, Inner Mongolia, reservoir of grasshoppers, habitat