Acute heart failure with low ejection fraction may improve in a short period of time after taking medication, and there is no accurate data on the exact time, and patients with chronic heart failure recover more slowly or even fail to improve. Patients with acute heart failure can experience a decrease in ejection fraction, and if heart failure is significantly improved after taking medication, the ejection fraction may improve in a short period of time, such as 1~2 weeks, but there is no clinical data on the exact time of recovery, and there will be significant differences between different patients. Commonly used therapeutic drugs include furosemide, isosorbide nitrate, metoprolol, and so on. Patients with chronic heart failure mostly have underlying heart disease, the underlying disease will exist for a long time, and will continue to progress, after treatment the ejection fraction recovery is slower, some patients can not be recovered, and may even be further aggravated. Patients with heart failure should actively seek medical attention and take medication under the guidance of a physician to avoid further aggravation of heart failure symptoms.