Medical polymer splints are gradually developed by the working people in the process of fighting with nature. Trace the developed history of China's traditional Chinese medicine bone, the use of small cedar planks through the "cedar hedge" fixed limbs long backbone parts of the practice. Nowadays, with the development of science and technology, the high hardness and light weight of polymer splints reduce the load of post-fixation functional exercise, facilitate blood circulation and promote healing. These splints in the material, production process and in the flexible application of the principles of mechanics have been significantly improved, and good therapeutic effects have been received in the clinic.