How long can a 40 year old with mild heart failure live cannot be generalized, if the condition can be actively controlled, the patient can survive for a long time, if the underlying disease is more serious, the survival time will be significantly shortened, and there are obvious differences in the survival time of different patients. Middle-aged 40-year-olds with mild heart failure should be given active treatment, such as oral furosemide, captopril and other drugs, to slow down the progress of the disease, such as the condition is stable, there is no rapid progression, can be long-term survival. Although some patients have mild heart failure, but the patients’ underlying disease is very serious, such as dilated cardiomyopathy, restrictive cardiomyopathy, etc., the patients’ condition will progress rapidly, the survival time is relatively short, and there is a risk of sudden death. Patients with heart failure should clarify the specific diagnosis and prevention of the disease under the guidance of specialized physicians, and give active treatment to prolong survival time.