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At present, the application of single chip microcomputer to control stepping motor in mechanized packaging machine is not very extensive. The pre-packaging film is used to feed the crank L ink drawing and intermittent machine, which has complex structure and difficult adjustment, and a lot of film is wasted in packaging. The stepping motor is directly connected with the pulling wheel, which not only simplifies the structure, is convenient to adjust, saves the adjustment time and saves the packaging materials. In this paper, AT89C5 1 is used as the microprocessor controller, the stepping motor is controlled by inputting data through the keyboard, and the digital data is displayed. While ensuring the normal driving of the stepping motor, the closest combination of the keyboard and the display is achieved, which makes the design more perfect. In the control of stepping motor, this paper focuses on the selection from the structural principle of stepping motor, and optimizes the control system of stepping motor according to the specific characteristics of electrical design, so that it can realize its function effectively and stably, and make some improvements. The system has the characteristics of stable work, low cost and easy application and development. Keywords: 89C51; Stepping motor; Display; packer