High carbon chromium bearing steel GCr15 was used as the material for piezoelectric actuator to meet the requirements of high hardness,wear resistance,corrosion resistance.Flexure hinges structure was adapted to preload piezoelectric ceramic and expand the output angular displacement.TMS320LF2407 DSP realized the control of motor system and improved system data processing performance and speed.Digital PID closed loop control in moving system could improve displacement resolution and repositioning precision of driver.In detection system,circular grating integrated on actuator would drive the actual output on the LCD display,and feedback the output to DSP for closed loop control.The single cycle angular displacement accuracy of the driver could reach up to 3 %.