There are two main treatment directions for floating thumb, one is to show the thumb thumb, remove the floating thumb directly and move the index finger to the thumb position as the thumb position. After the surgery, the baby can have a functional thumb, and the functional mobility is also okay, but unfortunately, the child only has four fingers from now on, which is not very aesthetic in appearance. There are two main surgical options: metatarsal reconstruction and hemimelia reconstruction. The biggest difference between these two approaches is the location of the bone, which leads to some differences in postoperative results and effects. Reconstruction of the metatarsal bone is the bone of the foot, which has a certain chance of bone resorption and necrosis, and also causes more damage to the foot, not only by adding new scars, but also by affecting the weight-bearing in the later stage. Babies need three months after surgery can not bear weight, can only lie or sit, parents need to spend a lot of time and energy to take care of. Some parents are busy and may not be able to provide comprehensive care, and the child suffers. The hemi-metacarpal bone graft reconstruction technique takes the second metacarpal bone of the affected hand, which greatly reduces the chance of bone resorption and necrosis. The surgery is performed on the hand only and does not affect other parts of the baby’s body, making post-operative care relatively simple. The hemipalmar bone graft reconstruction surgery is divided into two stages, and the shape and function are reconstructed step by step, and the overall postoperative effect is more ideal, so the baby can tie shoelaces, screw bottle caps, or hold some large and heavy objects, which can basically meet the needs of daily life.