For patients with coronary artery disease, if blood tests are needed, the blood indicators that can usually be assessed are blood lipids, blood uric acid, blood glucose, blood homocysteine, in addition to the conditions of patients should also improve the renal function, liver function and ion, especially for patients who are in perennial unstable angina pectoris with coronary artery disease, and have a history of hypertension, long-term use of drugs to lower blood pressure and treatment of coronary artery disease, to carry out long-term several of the above indicators monitoring. In addition, if the patient takes anticoagulant drugs, such as warfarin, etc., the coagulogram and D-dimer concentration should be checked regularly, and the patient should analyze whether there is chronic impairment of liver function and kidney function by the above-mentioned blood indicators. If there is a history of hypertension, it is also necessary to see if the patient needs to take vitamin B12 and folic acid according to the homocysteine level.