After European and American doctors used to opt for direct removal of the floating thumb followed by index finger thumbing and traditional hemi-metatarsal reconstruction, the latest technique for treating floating fingers, hemi-metacarpal bone graft reconstruction (SMRT floating thumb reconstruction), has become the procedure of choice for more parents and children. Compared to hemi-metatarsal reconstruction, the surgery is performed only on the child’s hand and the child’s foot is not affected in any way, and the growth and development of the second metacarpal bone is not affected after the surgery. It is also relatively easy to care for. It is worth mentioning that children can receive hemi-metacarpal bone graft reconstruction surgery between 6 months and 1 year old, so that the child can establish the function of the thumb earlier, and together with the recovery exercise at a later stage, the child’s thumb function and shape will generally be improved to a certain extent, and the child can write and draw, pinch green beans, hold chopsticks and eat, etc. The basic functions of the hand can be restored, and parents are satisfied with the post-operative results.