Considering the characteristics of the temporary stormwater pumping station，the calculation method of the pump station scale using storm hyetograph combined with pipeline regulation is proposed，and the scale of the temporary stormwater pump station is determined.Using Infoworks ICM model software，the drainage capacity of temporary stormwater pumping station was verified under the rainfall of the corresponding recurrence interval.According to the model calculation，the pump station size determined by the rain pattern method can meet the regional drainage requirements.This paper provides an idea for determining the scale of temporary stormwater pumping station.