There are close relations between the development of Loess Plateau and breaking-off of Yellow River.In this paper

based on rainfall experiments of Lou soil

the variation trends of infiltration supplement coefficient to rainfall were analyzed

the time variation trends of sediment content in runoff and the cumulative sediment content were compared at different rainfall intensities

furthermore

the erosion data was connected with infiltration characteristics to discuss their relations observed at the same time.The results showed: the infiltration supplement coefficient of rainfall decreased when the rainfall intensity increased

the smaller the rainfall intensity

the larger the rainfall infiltration supplement coefficients

and the linear functions were fitted well to them;at the beginning of rainfall

the biggest value of sediment content existed

but its variation trends became flat within 10 minutes of sediment producing.The larger the rainfall intensities

the larger the initial and steady sediment contents

but their total variation trends differs little.Moreover

there are similar trends of sediment distribution curve and infiltration ratio curve;good power functions was fitted for cumulative sediment content and rainfall time at different rainfall intensities

and the exponential part increased when the rainfall intensities increased.The variation trends of infiltration ratios differed with that of cumulative sediment content

when the cumulative sediment content increased

the corresponding infiltration rate decreased

their variation trends was obvious when the rainfall intensities increased.