Purpose: We aimed to improve the survival rates of out-of-hospital cardiac arrest patients. Methods: We analyzed data regarding cardiopulmonary resuscitation (CPR) outcomes and clinical characteristics of out-of-hospital cardiac arrest patients. The data included prehospital emergency medical service reports of 207 patients, 135 patients of Heart Saver, who survived over 72 hours after return of spontaneous circulation (ROSC) in Gyeonggi-do from January, 2012 to December, 2013. Data were analyzed using SPSS 18.0 descriptive statistics. Results: Among patients who achieved ROSC, 87.6% were men and 73.6% were aged 41-70 years; 86.7% were cases of witnessed cardiac arrest, and cardiopulmonary resuscitation was performed by bystanders in 65.9% of cases. The initial electrocardiogram showed ventricular fibrillation or pulseless ventricular tachycardia in 96.3% of patients. The call time was 1.0 minutes, arrival time was 6.3 minutes, time spent at the scene was 8.0 minutes, hospital arrival time was 10.0 minutes, and total CPR duration was 9.6 minutes. The certificate of them was paramedics in 89.6%. Conclusion: To improve the survival rates of out-of-hospital cardiac arrest patients, standard prehospital care for these patients and educational programs regarding CPR for lay rescues should be developed.