The father of a floating thumb child said that when the child was in elementary school, he was always made fun of by his classmates, who also used his right thumb as a toy. Despite the family’s better guidance, the child was still affected and would subconsciously hide his right hand when he saw strangers, and would use his left hand when handing things to others or picking things up. The child’s father said that they wanted to have the child operated, but at that time, they looked for many hospitals and said they could not do it. They also thought that it would be better to simply remove the floating thumb, but the child’s sister did not agree, so it has been left until now. The whole family was very happy to know that the floating thumb could be saved, and the child was also very excited. It is a very meaningful thing to save the floating thumb, but it is not easy to save the floating thumb, especially when there is very little soft tissue attached to the skin, it is difficult to keep it, but we will do our best to save it. Now we use the hemipalmar bone grafting technique, which is to take a part of the second metacarpal bone from the child to rebuild the first metacarpal bone without affecting other parts of the child’s body. Compared to before the surgery, the shape and function of the thumb are more satisfactory after the surgery.