The method for parametric modeling of the ascending aorta, aortic arch and its three branches according to the present invention belongs to the field of biological 3D printing modeling, and relates to a parametric modeling method for the ascending aorta, aortic arch and its three branches based on anatomical features . This method first obtains CT medical images of patients, imports the data into image analysis software, and adjusts various display parameters. The built-in thresholding function and region growing function of the application software, combined with manual correction, draws the mask of the patient's target blood vessel segment and surrounding constrained organs and tissues; segments the surrounding organs and tissues of the patient's artery, including the sternum, thoracic spine, superior vena cava, trachea, and Pulmonary artery trunk, generate a 3D model of the target vessel segment and surrounding constrained organs and tissues. This method improves the applicability of the implanted aorta and the life of the implant, and can adjust the geometric model of the target blood vessel segment by adjusting multiple sets of specific parameters, so that the blood flow design is personalized, with a high degree of freedom and a high degree of restoration. high.