Through analysis of the several communication technology, according to SCADA system in the metropolitan sewage transportion, completely unattended operation in the sewage pumping station. Used MPLSVPN technology to upgrade the communication network of the central monitoring system of the first stage of the Shanghai sewerage project that had run for 24 years. We complete integration stable transmission SCADA system in the metropolitan sewage transportion pumping station data and video image of the equipment running, Security precaution information according to the high reliability, high safety, scalability and good economical efficiency over the MPLSVPN technology.It injection new vitality for the tradition of SCADA system in the metropolitan sewage transportion that had stable run for 20 years.