This topic is carries on the optimized design to the existing offset press Automatic Register Control System, enhances to the low color difference signal recognition and the judgment, thus enhances the system the sensitivity and the precision.

This paper introduces the function and structure of automatic processing system of worksheet and analyzes its key technology which includes the pattern of client computer / service computer and the communication of client and service and programming technique, PRO C、AWK programming in the client computer and C、AWK programming in the service computer and so on.