A simulated rainfall study on cultivated red earths derived from red sandstone, phyllite, quaternary red clay in the northen Jianxi P-ovince and cultivated yellow brown earths from Xiashu Loess in the southern Jliansu Province, including six runoff experimental plots, was conducted for measuring water and soil losses in flattish hill region. Determination of some soil physical properties influencing soil erosion, such as soil permeability, was carried out.