By using the outdoor scouring method , it was studied the law of the runoff and sediment generation process at the underlaying surface of purple soil and yellow sand loam soil on grass slope .The results showed that:①with the erosion time increases , the accumulation cumulative runoffs of different underlaying surfaces also increase linearly . When the drainage flow is 10, 15 L /min, the cumulative growth rate of runoff are 3.735 and 8.579 respectively in III district with the largest accumulated run -off increase rate;②the runoff and sediment yield at different underlying surfaces showed a positive correlation , and growth rate of the relationship between water and sediment was ranked as II district (0.356) >III district (0.233) >I district (0.111) >IV district (0.056); ③the runoff and sediment yield at different underlying surfaces increased followed with the increase of the flow discharge , of which the runoff in different underlaying surfaces has the largest increase rate at IV district while the lowest at the I district that are 41 .58 and 16 .33 respectively .%采用野外放水冲刷法研究了紫色土与黄沙壤弃渣下垫面产流产沙规律。结果表明：①不同下垫面累积径流量随冲刷时间线性增加，放水流量为10、15 L／min时，累积径流量增长速率最大均为Ⅲ小区，分别为3．735和8．579。②不同下垫面径流量与产沙量均呈正相关关系，且水沙关系增长速率大小依次为Ⅱ小区（0．356）＞Ⅲ小区（0．233）＞Ⅰ小区（0．111）＞Ⅳ小区（0．056）。③不同下垫面的产流量与产沙量均随放水流量的增大而增大，在各种下垫面中Ⅳ小区径流量增长率最大，而Ⅰ小区的径流量增长率最小，分别为41．58、16．33。
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