Abstract: In order to realize the automatic control of folder pre-position system, a small integrated system based on PC-PLC model is set up, in which the PC is used as the high level computer and several PLCs are adopted as the low level controllers.In the developed control system, the PC assumes system's management and folding-model setting;the PLCs receive the dictates from PC computer and control stepping-motors to position and adjust the folding units.The control system has passed the experiment debugging, the functions of folding-model pre-position and automatic control of folding units are achieved.