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Pertinent to the multi-shaft synchronous control precision of printing press with shaft-less drive, the artificial potential field algorithm in the flocking motion control method is introduced and the traditional artificial potential field control strategy is given. This control strategy allows the rapid tracking of target value. However, in the traditional artificial potential field control arithmetic, there is no mutual relationship between various follower motors, which is unable to maintain the high synchronization performance. In this paper, the improved artificial potential field is proposed and the attractive force between adjacent motors is considered. The attractive force will drive the low speed motor to follow other motor rapidly. The experiment results demonstrate the improved artificial potential field control strategy makes the motor synchronization performance higher.