Chicken chest belongs to thoracic developmental deformity, which will change the shape of thorax and cause cardiopulmonary function abnormality in serious cases. In order to determine whether it belongs to the corresponding disease, it is necessary to make a comprehensive judgment through clinical examination, imaging examination and blood test. 1. Clinical examination: through clinical visualization and palpation, observe the specific thoracic condition and make preliminary judgment on the overall shape of chicken chest. The main signs are anterior chest wall proptosis, increased anterior and posterior diameter of the thorax, and hunchback. 2. Imaging examination: the commonly used examinations include X-ray and CT examination, through which the deformity of the specific sternum and the surrounding rib cartilage can be determined. 3. Blood test: part of the chicken chest is caused by rickets and most of the chicken chest is caused by vitamin D and calcium deficiencies, which can be determined by blood test. Through the comprehensive examination to determine the severity of deformity, need to be diagnosed after the condition, under the guidance of clinicians for standardized treatment.