As a special item of the “Eleventh Five-Year Plan” Informatization Project of the Chinese Academy of Sciences, the construction of the “CAS Networking Information Publishing Platform” (CAS Websites Group) is a huge system engineering project. The aim of the project is to establish a websites group among the Chinese Academy of Sciences, with the web portal of http://www.cas.cn/ (http://english.cas.cn/) as its main station and the websites of the secondary units of CAS as its sub-stations. This paper mainly introduces the design methodology and the implementation progress of the project, and discusses the sub-stations construction method and its implementation from the aspects of sub-stations construction method, project management and progress control. I do believe that the paper will be of reference value to the websites group construction of the governments and the public institutions.