Distributed control system is called DCS, which is a multilevel computer system composed of process Control level and process monitoring level with the communication network as the link, it synthesizes 4 C technologies of Compute), Communication, CRT and Control,  its basic idea is decentralized control, centralized operation and level to level  management, flexible configuration and easy configuration. The system mainly include the field control station (I/O station), data communication system, man-machine interface unit (operator station OPS, engineer station ENS), cabinet and power supply, etc. The system has an open architecture, which can provide multiple-layer open data interface. The hardware system has high reliability, easy maintenance, advanced technology in bad industrial field. The software platform with Chinesized bottom layer has powerful processing capabilities and can provide convenient ability for the control system with comples configuration and the ability for supporting the user to self-develop the special advanced control algorithm; it is easy for configuration and easy for using; it can support multiple fieldbus standards in order to adapt to the future expansion needs. The system design has appropriate redundancy configuration and diagnosis to the module level self-diagnosis function and has high reliability. In case any component within the system is in failure, it will not affect the work of the whole system. The parameters, alarm, self-diagnosis and other management functions of the system are highly centralized on CRT display and printed by the printer, the control system is really discentralized in function and in physics. Availability  of the whole system is 99.9% at least ; The System MTBF is 100,000 hours, realizing the complete monitoring to many fields including nuclear power, thermal power, thermal power, petrochemical, chemical, metallurgy, building materials etc.