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Currently mechanized packing machine application MCU control stepper motor to achieve is not very wide.before packaging films used for sending crank link Rafah with intermittent machine,complex structure,adjustment difficulties,and packaging waste a lot of film.Stepper motors and pull the wheel with direct links with Latin America,not only structure has been simplified and convenient adjustment,savings of regulation time,save packaging material.In this paper,AT89C51 as a microprocessor controller and input data through the keyboard control stepper motor,in addition to the use of digital data show.Guarantee the normal stepper motor driven at the same time,reached a keyboard and display most closely integrate the two,Let this design can be more perfect.In the stepper motor control,the paper highlights from the stepping motor can conduct a structural principle of selection,and in accordance with the electrical design of the specific characteristics of the corresponding optimum stepper motor control system to be effective,and stability to achieve its function,and make certain improvements.The system has a stable job,the characteristics of low cost,ease of application and development.Keywords :89C51; Stepper motors; Display; Packaging Machine