Under the foundation of Green-Ampt infiltration model established upon ponding condition

we expand it useful to calculate infiltration rate and cumulative infiltration in the variable rainfall intensities. Combined with the theoretical basis

we discuss the differences between constant rainfall intensity with variable rainfall intensity and the effect of saturated hydraulic conductivity and soil types on the infiltration process under variable rainfall intensities based on the saturated-unsaturated flow software Hydrus-1D. Research shows that: compared with constant rainfall intensity

variable rainfall intensities is more easily from the point of the rain infiltration; and the cumulative infiltration increases significantly. When other hydraulic parameters unchange

the larger the saturated hydraulic conductivity is

the coincidence rate of the curve of infiltration rate and variable rainfall intensity changing with time is higher. And the control time of rainfall intensity and the cumulative infiltration are larger accordingly. Other hydraulic parameters effects cannot be ignored; because the effect of them on infiltration can achieve similar to saturated hydraulic conductivity. Correctly understanding infiltration process and influential factors of rainfall infiltration upon the variable rainfall intensity will help us to accurately grasp the actual situation. So it has important practical significance to guide hydraulic engineering.