The Emergency Medical Services (EMS) aims to improve the survival rate of patients who are dead on arrival (DOA) at hospital, particularly those whose coronary artery disease (CAD) has induced sudden death. Based on the low prevalence of CAD-induced sudden death in Taipei city, as well as the differences between urban and rural communities in Taiwan, an understanding of the characteristics of rural areas is necessary in order to establish a well-organized and cost-effective EMS policy in this country. The data were drawn from a computer database which stored prehospitalization information from Ilan County from 1992 through 1994, including age, sex, response time, time spent on the scene, transportation time, service unit, reasons for emergency call and trauma mechanism. In 1096 study days, 20058 cases (18/day) were collected, of which 16560 (15/day; 83.6%) were transported to hospital. Trauma was responsible for the majority (77%) of these cases, followed by chronic diseases (4.0%), trivial matters (2.6%), drunkenness (2.3%), altered mental status (2.3%), suicide attempt (2.2%), and cardiac arrest (1.8%). Among the trauma cases, traffic accidents were the most common cause (84%); motorcycle accidents comprised 65% of trauma cases. The average response time was 6.6 minutes, time spent on the scene was 3.6 minutes, and transportation time was 17.7 minutes. Trauma and non-trauma accounted for half of the DOA cases, with each making up 0.9% of the total cases transported. In conclusion, it is important that the EMS needs of each community are known for a proper system appropriate to that particular area to be developed.