Abstract:The annual total runoff l control rate - the core index of sponge city can be elaborately calculated through the model. However, the establishment of the model needs to pay attention to the parameters and boundaries, and the generalization and rate determination are relevantly normalized. Therefore, in the modeling, the influences of rainfall sequence length and step length as well as the pipe network in the model generalization are considered to analyze. At the same time, the sensitive modeling parameters of permeability rate, impermeability, hardening area collection rate and different settings of evaporation are compared. The rate determination method is preliminarily explored. The conclusion can provide the reference for the establishment of runoff control models in the other sponge cities.