Abstract: In view of the shortcomings of existing data collection and analysis system in the production process of tandem cold mill， a synchronization method of strip segment data for tandem cold mill was proposed based on the mill equipment and instrument configuration of a 1450mm five-stand tandem cold mill， which consists of two parts: photo data building and synchronized data building. With this method， the various measurement parameters of rolling process can be synchronized to the rolled length at the last stand， and the rolling parameters of any coil length can be monitored through synchronized segment data. The method of synchronizing the strip segment data has been applied successfully in a five-stand tandem cold mill， and the control system runs steadily after putting into operation. The method of synchronizing segment data offers a convenient way for the technicians， who can diagnose production fault and analyze products quality rapidly.

Key words: tandem cold mill, data collection, process control, photo data, synchronized data