In order to compare the difference of the slope hydraulics processes for disturbed red soil when treated with PAM, stimulated rainfall experiments under different slopes, rainfall intensities and soil treatments were designed to investigate the relationship between runoff shear stress, flow power and flow kinetic energy with slope sediment transport rate respectively. The results show soil separate rate with runoff shear stresses, stream power and flow kinetic energy all have better linear positive relationship. When treated with PAM, the disturbed red soil critical shear stresses increase from 0.77 Pa to 1.47 Pa, critical stream power increases from 0.182 4 N/(m · s) to 0.367 6 N/(m · s), and critical flow kinetic energy increases from 0.301 8 J to 1.115 5 J. Among three parameters the stream power is the best parameter used to represent soil separate rate, and its multiple correlation coefficient is obviously better than that of runoff shear stresses and flow kinetic energy with soil detachment rate.