With the diversity of industries and of high position accuracy of the measurement equipment, the application of rotation axis have been applied at various industries. The accuracy of many product will be impact of indexing accuracy. The positioning accuracy of rotation axis become more important. In this research, a calibration system of rotational table is proposed, use in calibrate the positioning accuracy of rotation table. The system includes angular positioning measurement system, brushless DC motor, reflector. Rotate an angle of rotation table, and the angular positioning measurement feedback a signal to PID controller, then controller control the brushless DC motor, thus achieving the locked angle. Use measured values of encoder to calibrate the rotation table.