Objective Cardiac rehabilitation program is an essential part of the contemporary care of the patient with cardiovascular disease (CVD).Guidelines forprescribing aerobic exercise for patients with CVD is available elsewhere, except China.The major cause is the safety and the adherence.By the mid-1980s, it was established that post-MI patients could undertake prescribed home aerobic exercise safely and achieve a level of functional improvement similar to that resulting from supervised exercise in traditional CR.To investigate the effects of home-based exercise maintenance programs at the intensity of anaerobic threshold (AT: anaerobic threshold) for exercise tolerance in aged patients with acute myocardial infarction after primary percutaneous coronary intervention.