Heart bypass is usually not needed if there are no symptoms, and the situation can be observed first. Cardiac bypass surgery is usually performed when coronary artery disease is severe. Mild coronary artery disease can be controlled by taking medication to control symptoms and prevent further deterioration; if the condition worsens, coronary CT and coronary angiography can determine the degree of stenosis and which part of the coronary arteries in the heart, and it is recommended that stenting should only be considered if the degree of stenosis is quantified by the percentage of obstruction. If stenting cannot be accomplished, there is no suitable stent available for complex lesions or severe stenosis bifurcation or the long-term results of stenting are unsatisfactory, bypass grafting should be considered to ensure restoration of blood supply. Note that the heart is asymptomatic can be timely observation of the condition, under the doctor’s advice to rationalize the treatment.