Abstract: Aim To study the application of DSC in servo system. Methods When debugging servo system, the signal sending parts of servo system's detector made of DSC controlled the movement of servo system. Several import technical problems of making signal sending parts, such as the choise of DSC's power, the action of tuned capacitor, the design of power supply for DSC, the choice of apartment's sampling frequency, and the reducing of zero remained voltage were analyzed and studied. Results The sending parts made of DSC was used to effectively control servo system to achieve the required movement in debugging servo system. Conclusion To combine the sending parts made of DSC with singal sample parts can achieve automatic detective of servo system.