Dysplastic thumb with floating finger needs to be improved through surgery. This is because the thumb occupies 50% of the hand’s function, and the floating finger is completely non-functional. Without a functioning thumb, it is impossible to perform fine movements such as palm-to-palm, grasping, pinching and pinching, and the child’s ability to write and hold chopsticks is affected. Floating finger also affects the aesthetics of the hand, and as the child grows, it has a psychological impact on the child. Many of the older children who come to the clinic show that they don’t want other people to pay attention to their hands, and they are reluctant to show their hands to other people. In addition, due to the floating finger, many children are used to using the index and middle fingers to pinch objects, and over time, these two fingers will be deformed. Therefore, children with floating fingers should have the function and shape of the thumb improved through surgery as early as possible.