The characteristics of runoff and sediment and their changes in Jinghe watershed.were analysed in detail

According to the basis‘laws of forming runoff and sediment

the hydrological method was used to calculate the benefits of runoff and sedi-ment reduction

It was concluded that durng 1970}1989 the benefits of runoff and sediment reduction account for 7

5 percent and 14

4-。en respectively through the comprehensive control on the watershed

and the influence f runoff and sediment.reduction for 32 percent and 48 percent respectively by the reduced precipitation

C3ood_identity is found between the results of hydrological method and the ones of im plementing the measures of soil and water conservation

After of the sharp reduction of sediment in 1980s

it was indicated thsediment reduction are reduced precipitation

The influences anvaysing the causes at the mayor causes of redued precipitation and comprehensive control on sediment reduceion are respectively

about gg percent and 37 percent