The purpose of this study is Investigating Effect of correcting illness perception on adherence to therapeutic regimen and quality of life in patients with Acute Coronary Syndrome. It’s a quasi-experimental study. Subjects of study are ACS’s patients hospitalized in CCU, Post CCU. 76 eligible patients will be enrolled in two groups. Inclusion criteria: Confirmed Acute Coronary Syndrome, ability to understand Persian, having negative illness perception, does not be under another study, doesn’t have complication of ACS, doesn’t have chronic disease, doesn’t have mental disorder, and doesn’t have cognitive disease. Exclusion criteria: Being in acute phase of disease, wouldn’t like to continue, Discharge before completing intervention. After completing informed consent, demographic information, adherence to therapeutic regimen ,quality of life and illness perception(IPQ) questionnaires in second day of admitting ,in control group without any intervention IPQ will be completed in forth day. intervention group will be done correcting illness perception intervention in 3 sessions, for consecutive days, about 30 minute in the morning shift. Then intervention group will be followed with telephone contacts at afternoons every week in first 3 weeks, next every other week until twelfth week. adherence to therapeutic regimen and quality of life questionnaires will be completed the week 3 and 12 for both groups.