The key issues on real-time data acquisition technology during SIS construction,type selection for the real-time/historical database,function setting,and network framework are discussed and analyzed.

This paper introduces the construction of supervisory information system in fossil fuelled power plants,including selectionof real-time/historical database,data acquisition technology,development of application software and network topology,etc.

PI,a real-time/historical database,had been extensively applied in plants information process which was superior in efficient access and large data storage to relational database.

The thought of the study and development of SIS is proposed to establish a uniform data center platform based on the foreign large and special real-time and history database, moreover, to study and develop particular function modules and assistant tools on self-dependence.

Application of Berkely DB to real time/history database;

Then through an example in electric power system, the method that VC++ 5 0 realize the accessing to thehistorical database is stated by using ODBC under the environment of Windows95.

A programme designed with VB aiming at the historical database section of an industrial realtime information system in some petrochemical plants,which realizes the historical data storage from PHD real time database to Oracle relational database is introduced.