Taking Dalang River Basin, Shenzhen city of Guangdong Province as an example, HSPF model was used to simulate hydrological effects of rainfall runoff under different scenarios. The results showed that runoff rate of the efficacy maximization, economical and moderate scenario were decreased by 34.9%, 14.2% and 28.5% than that in background scenario. The peak value of these three scenarios were lower 40.5%, 19.8% and 33.0% than that in background scenario. Base flow of these three scenarios were higher 88.9%, 11.1% and 44.4% than that in background scenario. The economical scenario didn’t reach good effect. The effect of moderate scenario was better than economical scenario and inferior to efficacy maximization scenario.