1. Preoperative auxiliary examination Preoperative laboratory tests for blood routine, urine routine, stool routine, liver and kidney function, blood glucose, electrolytes and clotting time, chest X-ray orthopantomograph, cardiac ultrasound, and ambulatory electrocardiogram. 2.Medication preparation: Stop the use of blood-activating drugs such as heparin, aspirin and warfarin before surgery to prevent intraoperative bleeding and formation of hematoma in the subcutaneous pouch. 3. Psychological care: Before the operation, let patients and their families fully understand the necessity of pacemaker installation and the general process of placement, so that patients can eliminate their worries and actively cooperate. Huang Shen, Cardiac Arrhythmia Treatment Center, Guangdong Provincial Hospital of Traditional Chinese Medicine 4. Preoperative training of bed urination and defecation, instructing patients to master the whistling and breath-holding action so as to cooperate with venipuncture for insertion of pacemaker catheter. 5, skin preparation preoperative skin preparation range should be larger, because the scheduled venous cannulation such as failure, often in its vicinity or even change to the contralateral puncture, surgical site cleaning should be thorough. Establish venous access. 6, preoperative diet preoperative meal should be less but not forbidden diet, to prevent the patient deficiency, hypoglycemia or poor venous filling. 7, drug preparation preoperative routine antibiotic (such as penicillin) test, and a good procaine test. 8. Cardiac catheterization laboratory preparation for the procedure: 1) Drugs: iodophor or iodine for disinfection, 70% ethanol, local anesthetic drugs, 1% lidocaine or 1% procaine. 2) Pacemaker and pacing electrode lead, spare tearable venous introducer sheath to match the pacing lead. 3) Surgical instruments for the implantation procedure. 4) Cardiac monitor and defibrillator, oxygen, endotracheal tube and necessary resuscitation drugs.