Based on the experimental plot research in Ansai Integrated Experimental Station on Water and Soil Conservation

the effects of landuse pattern change on runoff in slope scale were discussed.Four kinds of landuse patterns were designed in the loess area

including millet only(pattern a)

two-thirds millet and one-third panicum virgatum(pattern ab)

two-thirds millet and one-third abandoned land(pattern ac)

and two-thirds millet and one-third alfalfa(pattern ad).Research results indicated that runoff had close relationships with high rainfall amount and changed with seasonal rainfall.Compared with pattern a

the other three landuse patterns(ab

ac

and ad) had positive effects of runoff reduction in the same degree.With the slope degree varying from 10° to 25°

runoff from the plots of patterns a

ab

and ad increased all along

but runoff from the plot of pattern ac decreased after increased.Because of the compound effects of vegetation cover

rainfall

and disturbance

monthly runoff was not consistent with annual runoff.