The effects of planting types(ridge planting and furrow planting) on runoff,sediment and surface soil structure stability were determined in vegetable field with polyethylene mulch and ridge-furrow system of contour terrace in the Dianchi lake's catchment.The results showed that there were no significants difference of bulk density,pores distribution and water stable macro-aggregates(>0.25 mm) content between furrow planting type(FP) and ridge planting type(RP) in 0-5 cm soil layer after vegetable harvestin...