During soil erosion process,soil aggregate transport reflects the broken degree of soil aggregate and runoff transport capacity,which directly affects soil erosion degree.A laboratory rainfall simulator study was conducted to determine characteristics of sediment yield and soil aggregate transport of different size fractions(>5 mm,2~5 mm,1~2 mm,0.5~1 mm,0.25~0.5 mm and <0.25 mm) under different soil surface conditions on typical black soil in the northeast China.Three soil surface conditions were designed: ...