After cardiac surgery in infants and children, it is difficult to fix the sternum properly after surgery because the sternum is split medially. If the sternum cannot be fixed satisfactorily, the stability of the whole thorax will be affected. Therefore, many children will have an anterior protrusion of the thorax after surgery, forming a postoperative pigeon chest. In addition to the instability of the sternum, it may also be related to the child’s own factors and care after surgery, so it is very difficult to avoid it completely. However, once this deformity appears, it is usually difficult to disappear spontaneously and may become more and more severe with increasing age. This brings with it many complications associated with it. The diagnosis of post-operative cardiac pectus excavatum is relatively simple, as it can be clearly diagnosed with the naked eye, as is the case with normal pectus excavatum. Because the entire thorax protrudes forward, compression of the heart can be disregarded, so tests such as CT are not necessary, but plain X-rays can help assess the relationship of the heart to the sternum. Compared to other types of thoracic deformities, surgery for pectus excavatum is more complicated, and because of the severe adhesions of the sternum to the heart due to the heart surgery that has already been performed, ordinary sternal sink surgery is less suitable. Even if such a surgery is used, the results are certainly not satisfactory. This type of pectus excavatum does not involve an increase in the circumference of the thorax and would be very problematic if the sternum were to be lowered by intercepting the rib cartilage. Given the young age of such children, surgery using internal fixation may be considered. However, due to the complexity of the operation and the high technical requirements, few units have been able to perform this type of surgery so far. Based on the extensive treatment of various thoracic deformities, we have made the treatment of pectus excavatum a key surgical component. At present, the treatment in this area is at the advanced level in China.