Congenital hip dislocation needs to be fixed with herringbone cast for 6 weeks after surgery, and currently the chosen casts are ordinary plaster and polymer cast, in addition to herringbone support. Ordinary plaster cast, the advantages are economic, fixation is true, easy plaster molding, remove the plaster is also very convenient, almost any hospital can remove the plaster; the disadvantage is a little heavy, postoperative review X-ray is not as clear as the preoperative. Polymer plaster, the advantages are light weight, air permeability, X-ray transmittance (postoperative and preoperative as clear); the disadvantage is expensive, postoperative a polymer plaster can be replaced by ordinary spray plaster 8~10, in addition, it is very laborious to remove the plaster, need to saw more than 3/5 of the workload, and the risk of injury to the child’s skin is relatively increased. Hip herringbone brace, the advantages are lightweight, easy to wear and remove, translucent ray; the disadvantage is, expensive, fixed relatively inaccurate, lined with sponge contact easy to sweat, resulting in the skin was soaked “floating bag”, or even skin ulceration. Therefore, each of the above fixation materials has its own advantages and disadvantages, and all of them can serve the purpose of maintaining the femoral head in the postoperative period, so that the surgeon and the parents of the patient can make a decision after consulting with the surgeon on the principle of the fixation materials.