Abstract: In order to study the principles and methods of the chemical industry simulation training system’s realization, promote its development, as to the beginning, stopping and accident handling operations of the group of four valves(GFV) in chemical industry, this article makes the simulation pictures of industrial DCS and field, develops its simulation algorithm of opening and flow rate, describes its simulation database and the course of data transmitting, fulfils its simulation operation based on the databaseorientated architecture and the development mode supported by simulation environment. This kind of development method is not only clear and easy to study, but also has high reusability rate and can promote the continuous development of the simulation environment,　plays an important part in the development of simulation training system of other chemical industrial process.

Key words: group of four valves, chemical industry simulation training system, realization, mathematical model