Abstract: This paper analyses the sensitivities of the parameters in the unsaturated soil hydraulic conductivity model developed by Shao Mingan.The sensitivity degrees of unsaturated soil hydraulic conductivity to different parameters are calculated by using the laboratory measured data to compare the influence of parameters on soil unsaturated hydraulic conductivity.The results show when the linear function is adopted to express the relation of average moisture of soil profile and moisture of wetting front,the sensitivity of parameters are much higher than the other parameters in Shao's unsaturated hydraulic conductivity model.