Abstract:According to the working principle of angular instrument installed in Xray diffractometer, a kind of double rotating table based on timegrating sensor technology was designed. The rotary table had two axes which were driven by two stepping motors, they could be rotated synergistically with different angular speed rates, including the θ-2θ movement of diffractometer, by controlling the speed of two stepping motors. It can not only provide the fundamental function for diffractometer, but also can realize the function of rotating independently by adopting the design of mutual center and axis.