Research conclusions: From the research it is concluded: (1) On full consideration of the acceptance capacity of the municipal drainage，the flood level and river bed elevation of the water-receiving river, the integrated pipeline around the depot and the drainage safety under emergency condition，the rainwater pumping station should be used to pump the depot's rainwater into the river nearby to solve the problem of discharging the rainwater. (2)By increasing the pipeline diameter of the starting area and connecting the pipelines into loop，not only is the capacity of rainwater drainage under emergency condition enhanced，but also the safety of rainwater drainage of the depot is insured.(3)This design can provide a reference to the similar rainwater drainage works.