The epidemic of covid-19 has spread all over the world and has a great impact on people's health and life. The patients' prognosis is poor because the epidemic situation runs on medical resources, delays the diagnosis and treatment of other diseases such as cardiovascular diseases, and the patients' willingness to see a doctor is reduced. In particular, the delay in the treatment of STEMI, which needs PCI treatment, will cause more damage to the patients. It is necessary to study the treatment of STEMI patients in the real world under the influence of the epidemic. In this study, STEMI patients who experienced emergency PCI treatment after the covid-19 outbreak in 2020 were included, and compared with the data of the same period in 2019,we will analyze the pre hospital treatment time, vascular opening time,and the major cardiovascular adverse events, which provide effective suggestions and strategies for emergency and severe treatment.