[Objective] The infiltration situation of newly increased sloping farmland of Weibei tableland area was researched, and the impacts of soil volume weight, slope degree and flow discharge on sediment yield were analyzed.[Methods] Simulation test was used in door.[Results] Soil infiltration rate firstly increased and then decreased with the increase of flow discharge, an obvious inflection existed midst, and it decreased with the increase of soil bulk density. Runoff increased with the increase of soil bulk density and flow discharge. The greater bulk density was, the more sediment was, i.e., sediment yield of soil with bulk density of 1.6 g/cm³ was greater than the ones of 1.2 g/cm³ and 1.4 g/cm³. With the increase of slope gradient soil erosion was more heavy. A threshold of slope gradient existed at 5°. The large flow discharge resulted to much sediment yield, this was obvious when the flow discharge was over 6 L/min.[Conclusion] Soil erosion of newly increased sloping farmland in Weibei Tableland area was closely related to soil bulk density and slope gradient. For these reasons, soil bulk density should be small than 1.4 g/cm³, and slope gradient should be less than 15°.