Through analysing the characteristics of hydro-environment on the loess plateau

It is pointed that the precipitation of loess plateau has two characters： one is low

the other is intensive

which can result in a strong soil and water loss. Soil moisture is always in stress statue there. The productivity of basic farmland and forest-pasture land has been seriously stressed by water shortage

and the runoff is affected by precipitation. The eco-environment should be improved by biological

engineering and chemical measures for soil and water conservation (SWC) in order to adjust water condition on the loess plateau. The SWC measures can bring impacts on hydro-environment in two aspects. (1) In land section scale

it can harvest rainwater and increase soil infiltration rate

which made soil can provide more water to plant; (2) For some high water consumption land

such as forest and pasture

the water stress can only be modified

and the hydro-environment should be considered into the constructing of vegetation; (3) For watershed scale

the SWC can increase water storage and evaporation

meanwhile

it can decrease runoff.