In order to meet requirements of smooth running in low speed and precise performance for two phase hybrid stepper motor in the control system of computerized embroidery machine, introduce stepper motor two phase deriver scheme and its constant torque even subdivision current control strategy. Taking high performance (HP) micro processor unit (MPU) as coring, combined DAC0832 transformer chip with bipolar driver NJM3777 to construct stepper subdivision drive system. The comparison result shows that, by using this method, the stepper motor step torque resolution is improved, the system is running stable in low speed and small torque, and the system is low in noise when running.