4. Interventions:salvianolate injection group: salvianolate injection, intravenously infusion,0.2g/time, once a day; other routine treatment according to the condition of the disease.Aspirin group: aspirin, oral administration method,0.1g/time, once a day; other routine treatment according to the condition of the disease.Salvianolate injection and aspirin group: salvianolate injection, intravenously infusion,0.2g/time, once a day; aspirin, oral administration method,0.1g/time, once a day; other routine treatment according to the condition of the disease.