Stipa grandis is one of the most important forage in typical steppe. It has the broadest distribution in Inner Mongolia. In this study,random amplified polymorphic DNA(RAPD) analyses was used to estimate the genetic diversity and ecological variations and explore connection of grazing intensity and genetic variation of S. grandis. A total of 16 primers were used to detected seven populations of S. grandis in different region. The polymorphic products percentage was 89.55%,testified individual ex...