The Analysis of Hydro-environment and Influencing Factor——a case study of Lanzhou-Xining area

According to the statistical and measurements in Hydrographic,Using GIS technology and statistical methods,analysis the evolution of hydro-environment in Lanzhou-Xining area.The paper makes conclusion that:①The water relation between supply and demand,as the urban economical constructions,is getting worse,in the other hand,the relation is the natural logarithm between urbanization and water supply;②The basins water is mainly of Agricultural and farm,in the Gansu belt,water supply concentrates on industry、town public、 afforesting and greening;③by means of water Function and water environmental protection goal,surface water fall into five categories,water quality in western part is better than eastern,and the Mountainous and Hilly Area better Loess Hill and Gully Area.Finally,the paper researches the evolution elements in hydro-environment from different angles.