[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°.