This work was carried out in grassland ecosystem at Basin of SilinRiver, Inner-Mongolia, for understanding the community structure and standing crop of small rodent in different biotope.The results obtained show that the specific biotope usually get together with a specific dominant rodent,and the different rodent community structure occour in different biotop. Living in the preferable habitat the rodent population has higher nutrient level and biomass. The nutrient standing crop of small rodent community m...