Abstract: In this paper, a robot-assisted orthopedic operation system is introduced. The system consists of the surgery planning software and the orthopedic robot. With the surgery planning software, doctor can collect the X-ray images at the fracture of the patient. The robot makes the fracture site of patient close and reposition, through a serial of movements such as pulling, rotation, and reposition. The robot replaced the doctors to work in the radiant environment, and improved the efficiency, accuracy and security of the operation. This system has been successfully applied to the clinical applications.