In this study, MI rats and peritoneal macrophages were treated with Calhex231, CaSR agonist, autophagy agonist, and antagonist or the inhibitor of NLRP3 inflammasome in order to elucidate the role and molecular mechanism of Calhex231 in myocardial fibrosis post MI. The gene discussed is CASR; the disease is Myocardial fibrosis.