The risk of heart valve replacement surgery cannot be generalized, as it is a routine surgery, and the size of the surgical risk is related to the degree of lesions, age, other organ dysfunction and other factors. 1. Degree of lesion: If the mitral or aortic valve stenosis and valve closure insufficiency are more serious, resulting in significant enlargement of the heart or decline in the function of the left ventricle, i.e., the ejection fraction decreases significantly, or even combined with coronary artery stenosis, i.e., combined with coronary artery disease, the need to carry out a cardiac bypass grafting surgery, and the risk will be higher. 2. Age: the older the patient is, the lower the resistance to surgical strikes, and the higher the risk will be. 3. Other organ dysfunctions: Older people with chronic bronchitis, pneumonia, recent cerebral infarction, cerebral hemorrhage or even infected endocarditis, or preoperative renal dysfunction, need dialysis treatment, the risk of surgery will be relatively high. It is recommended to communicate with your doctor before surgery to fully understand the risks of surgery.