To meet the safety requirements during producing and storing flammable and explosive medium, a scheme of computer monitoring system is proposed based on Monitor and Control Generated System(MCGS). The slave computer adopts S7-200 series Programmable Logic Controller(PLC), to realize the centralized management of data acquisition and real-time monitoring by using the PROFIBUS network technology. The development of the system configuration, database design, and graphic interface are described. The system provides real-time and historical curves of the parameters, displays alarm window, automatically generates data reports. Monitoring data are displayed through animation interface to realize the integration of real-time system and information system. The practical operation indicates that the proposed system bears stable performance and good reliability; and its process automation efficiency has been improved significantly, which achieves the design goals.