Abstract: In order to understand the changes of the species diversity of plant communities on degenerated grassland reseeding in Pingluo, mechanical seeding was used to reseeding degenerated grassland in this study.The changes of the species,height,coverage,density and aboveground biomass of plants were monitored. Monitoring results show that the reseeding could improve species diversity,species richness, plant life type,but it reduced vegetation coverage,density and aboveground biomass.