Abstract: The traditional multi-drive synchronous control system for weaving and dyeing machines has such drawbacks as inconvenient in operation and management,high fault rate,and great maintenance workload that give negative impact on production.For this reason,after studying the principles and methods of variable frequency adjusting speed synchronization of several kinds of multi-drive system,a new scheme using the RS-485 control bus to realize multi-drive variable frequency adjusting speed synchronization system is proposed and the DCS which is based on MCGS are designed for it.The results indicate that the structure of synchronization drive control system is simplified greatly,the equipment costs are reduced and the reliability and management level are improved significantly.