More and more children with congenital malformations of the hand are coming to us, but many of the questions asked are very similar. Parents are also particularly interested in seeing examples of surgery, and it is recommended that you first read the articles in my website so that the questions are targeted and can greatly save you from having to delay your visit until very late each time. In view of the fact that many families of children ask about the correction of complex deformities in polydactyly of the thumb, I will show more surgical cases for the benefit of readers when I am a little free. For children with relatively intact bony joints of one finger and functional tendons of the other finger in polydactyly, it is possible to achieve good treatment results with a reasonable surgical design. The concern of leaving a thin finger can be avoided with a delicate flap-forming technique. In this child from Sichuan, the lateral phalanges and joints were relatively intact, but there was no flexion or extension; the medial phalanges were hypoplastic, but there was good flexion and extension. During the surgery, we preserved the major lateral bony joint and transposed the tendon system of the medial finger to the lateral side to reconstruct the extension and flexion of the finger, and the following is the immediate postoperative appearance, which is still good.