Considering the report function of WinCC configuration software is not perfect, the network report function have to carry out by the expensive component of the Web Navigator, though it is powerful. According to the deficiency of WinCC report function, this paper puts forward to realize WinCC network report system using the technology of Ajax, ASP and so as the other web technologies, after the investigation of the archiving structure of WinCC variable. Directly read the SQL Server archive database system, remote viewing WinCC reports and tendency chart, also has a similar user experience of desktop applications. WinCC network report system has been successfully applied to the process of sewage treatment.