After analysis and study on the problems encountered in dewatering in special stratum that can not be solved by traditional cased well dewatering, the author puts forward the dewatering construction technology that combines the cased well dewatering technology with the vacuum dewatering technology to solve the problems in shaft construction. On basis of CRD tunnel construction method, followup vacuum dewatering is applied to solve the problem that dewatering construction can not be performed on the ground surface.