Abstract: The exploring works of plant SIS construction in stages in Hunan Huadian Changsha Power Generation Corporation Limited were introduced. It is pointed out that for a successful SIS construction, the first stage is to construct the fundamental function of the SIS, and the advanced function of SIS should be developed in following-up stages. The informatization direction of power plant was investigated.

Key words: plant supervisory information system (SIS), construction in stages, advanced function, informatization direction