The purpose of this study is to investigate the effect of an educational intervention based on illness perception correction on control of some risk factors and incidence of acute coronary syndrome in patients with coronary artery disease. This work is a clinical trial study with a control group, with patients undergoing angiography hospitalized in cardiology and post-angiography unit. One hundred patients, having inclusion criteria for the study, were randomly divided into two intervention and control groups (fifty patients for each group). Inclusion criteria: Being a candidate for angiography, not having a history of acute coronary syndrome, not having mental disease, not having cognitive disorder, not being a subject for another study. Exclusion criteria: Not being diagnosed with coronary artery disease by angiography and deterioration of the patient's medical condition before completing the intervention. Random allocation was determined based on odd and even weeks. After completing informed consent, demographic information and the status of some cardiovascular risk factors (systolic blood pressure, diastolic blood pressure, triglyceride, total cholesterol, fasting blood glucose, body mass index, smoking) and illness questionnaire-revised (IPQ-R) were completed before performing the angiography in the control and intervention groups. The control group just received routine care of the unit. In comparison, the intervention group received illness perception correcting intervention individually for three sessions. Then, the intervention group was followed up with telephone contact for three months after discharge. Six months after the clinical trial, the illness perception questionnaire-revised was completed and the status of some cardiovascular risk factors (systolic blood pressure, diastolic blood pressure, triglyceride, total cholesterol, fasting blood glucose, body mass index, smoking) and the incidence of acute coronary syndrome in both groups were assessed.