Inclusion Criteria:  age ≤ 18 ≤75; 7-30 days after onset of STEMI;  PCI was not performed for the following reasons:  Stabilize the condition at a hospital that is unable to provide PCI and then refer to a tertiary hospital for further evaluation; Previous emergency angiography without balloon dilatation or stent implantation; Emergency thrombus aspiration without balloon dilation or stent placement; Patients with target lesion stenosis of 50%-90%, GRADE 3 TIMI blood flow and indications for stent implantation after receiving STEMI treatment in accordance with hospital standard procedures.  Exclusion Criteria:  Left main disease or bypass disease; Intolerance to research drugs, metal alloys or contrast agents; Life expectancy is less than a year; PCI was performed on previous target vessels; Previous coronary artery bypass grafting; cardiogenic shock or LVEF&lt; 35%; Severe renal or liver dysfunction; Hemodynamic instability; The degree of pathological stenosis of criminals was > 90% or < 50%; Target vessel TIMI blood flow ≤ grade 2; A surgical plan within 6 months after the initial operation; Had clinical indications of intolerance to 12-month DAPT therapy; Unable to provide written proof of informed consent; Patients who were enrolled in other clinical trials at the time of enrollment and did not meet the primary study endpoint.