The foundation of Meizizhou open excavation section mainly consisted of approach channel and shield excavation well. Due to the large-scale excavation, abundant groundwater and complex geological conditions, dewatering in foundation pit became one of many key technologies. Because of the simple circumjacent environment, the scheme of dewatering in foundation pit was designed based on the pumping test. It was proved that the scheme was rational and feasible without unfavorable influence to the environment.