Feeding control system of bag-making machine was designed using 32 bit ARM CPU as control core and embedded operating system Windows-CE as application platform. The control system used "working-inquiring" mode. Dual-servo system was developed for the bag-making machine and frequency conversion driver capable of safe working with loading was selected. The operation result showed that the control system based on ARM Core CPU improves timeliness and control precision, and realizes constant tension feeding and the constant tension hauling and the coordinating among the rotational speed of the main motor, the length of bag, and the hauling speed.