Minimally invasive small cardiac incision surgery, with hidden incision sites, less muscle damage and blood leakage, can meet the needs of cardiac patients and has high clinical value. Four common minimally invasive cardiac surgeries 1, thoracoscopic assisted treatment of rheumatic heart disease Conventional valve replacement surgery incision is the anterior median incision of the chest, the length of the incision is about 20-25 cm or more, which is traumatic, affects the aesthetics and leaves 3-4 wires in the body. TV thoracoscopic cardiac surgery is considered to be another major technological revolution in the field of cardiac surgery since the introduction of extracorporeal circulation. It is a representative procedure of modern minimally invasive cardiac surgery. 2, transthoracic minimally invasive non-extracorporeal circulation atrial septal defect closure In recent years, interventional treatment of congenital heart disease has played an important role in the closure of atrial septal defects. This new procedure is performed by making a small incision of about 2 cm in the right anterior chest next to the sternum, placing a pusher and releasing the atrial septal defect blocker under the guidance of esophageal cardiac ultrasound, with an average intracardiac operation time of about 10 minutes and a total operation time of less than 1 hour. The average hospital stay is 3 to 4 days. The advantages of transthoracic minimally invasive non-external circulation atrial septal defect occlusion: ①No need for extracorporeal circulation, avoiding the complications of extracorporeal circulation. ②Wide range of surgical indications. ③The surgical incision meets the cosmetic requirements. The patient suffers little pain and recovers quickly, especially for female patients, without affecting breast development. For the reproductive system, the hazards of traditional percutaneous interventional occlusion rays are also avoided. ④The admission time is significantly shortened and the cost is low. 3.Minimally invasive cardiac surgery with small incisions in the chest The indications for minimally invasive cardiac surgery with small incisions in the chest are atrial and ventricular septal defect repair. Compared with traditional surgical methods, transthoracic small incision surgery has the advantages of small trauma, small scar, fast recovery, short operation time and no extracorporeal circulation device; compared with the catheter interventional method, only cardiac ultrasound monitoring is required, which can make patients with congenital heart disease avoid X-ray irradiation, and the indications are broader and not limited by age and weight of patients with congenital heart disease. It is a new surgical method that combines the advantages of catheter intervention and traditional treatment. Moreover, long-term observation shows that the incidence of postoperative residual shunt after transthoracic small incision surgery is low, safe and reliable, which is a new technology of minimally invasive cardiac surgery worth promoting. 4.Thoracoscopic treatment of congenital heart disease with extracorporeal circulation chest wall perforation Thoracoscopic treatment of congenital heart disease with ventricular septal defect and ventricular septal defect is performed with three 1 to 2 cm holes in the left and right chest walls.