A complex coupled relationship between grasshopper and vegetation is often recognized.The characteristic change of grasshopper community is an important ecological response to the plant community.In the Baidaban grassland of the upper reaches of Heihe River

sample investigation methods were used to study grasshopper community composition

diversity and its relationship with the plant community from June to August

2009.Thirteen species of grasshoppers were identified among seven plant communities.The grasshoppers was composed of ten genera of three families

within whichOedaleusdecoratus

Gomphocerus licentiandChorthippus albonemuswere the dominant species in the research area.The highest populations were found in the plant communities dominated byArtemisia dalailamaeorStellera chamaejasme.The community composition and dominant species were significantly different in seven plant communities.However

no significant difference was found for evenness index (p>0.05).Grasshopper community diversity and species richness had positive correlation with vegetation coverage and diversity

but related negatively with plant height and plant dominance index.Meanwhile

grasshopper abundance was high in species-enriched plant communities.Negati-ve relationships were identified between grasshopper Pielou evenness index and plant community diversity

and grasshopper dominance index had positive correlation with plant dominance index.Grasshopper distribution and population were affected by biology characteristics of grasshop-per and plant community composition.Grasshopper choice diversity to plants reflected strong adaption and cooperation function of the grassh-opper population.