To elucidate the efficacy and safety of weixin decoction in the treatment of heart failure after myocardial infarction.

To elucidate the long-term protective effect of flavored Wenxin Decoction on heart failure after myocardial infarction.

To elucidate the effective components in the treatment of heart failure and the mechanism of metabolism regulation.

Inclusion Criteria:

• 18-75 years old；
• A history of acute myocardial infarction；
• Cardiac function Ⅱ - Ⅲ level；
• LVEF 50% or less;
• Nt-probnp level ≥ 450 pg/ mL；
• All men and women can sign the informed consent form.

Exclusion Criteria:

• Coronary artery bypass grafting was performed within 12 weeks；
• Undergo or possibly undergo cardiac resynchronization therapy;
• Primary valvular disease, left ventricular outflow tract obstruction, myocarditis, aneurysm, uncontrolled severe arrhythmia, cardiogenic shock, unstable angina pectoris, or acute myocardial infarction;
• Having a serious primary liver, kidney or blood system disease or having a serious mental illness or a systemic disease that is out of control;
• Serum creatinine > 194.5 mol/L or serum potassium > 5.5mmol /L;
• The level of alanine aminotransferase or alkaline phosphatase is 1.5 times of the normal upper limit of >;
• Abnormal blood pressure control, systolic blood pressure exceeding 180mmHg or diastolic blood pressure exceeding 110mmHg;
• Pregnancy or lactation; Known or suspected allergy to research drugs; To receive another investigational drug within 30 days of randomization or to be unwilling or unable to provide written consent.