Abstract: The present invention relates to a medical use of Cellular Repressor of E1A-stimulated Genes (CREG), in particular to a use of CREG protein or active fragment thereof in manufacture of a medicament for preventing and/or treating myocardial infarction, a use in manufacture of a medicament for preventing and/or treating ventricular remodeling after myocardial infarction and heart failure after myocardial infarction, a use in manufacture of a medicament for prevention and/or treatment of myocardial ischemia-reperfusion injury, a use in manufacture of a medicament for prevention and/or treatment of salt-sensitive hypertensive myocardial fibrosis.