Abstract: Taking the characteristics of a hot strip rolling line into account， a Windowsbased platform of the process control system was designed and developed to meet the actual requirement on the spot. The platform adopted multiprocess structure and each process adopted a new mode of “one task one thread”， which improved the system stability and reduced the coupling of functional modules. The key functions of the platform included process managing， network communicating， data collecting/managing and process tracking. Data communicating， database operating and process data recording， and strip tracking together with thread dispatching were implemented separately by these modules mentioned above. Each module was scheduled by an event signal trigger method which had shorter response time. This platform successfully ran on some hot strip rolling lines with good stability and reliability.

Key words: multiprocess, multithread, multitask, process control, hot strip rolling