People with deliberate self harm behavior are the high risk group for suicide, and the prevalence of self-harm behavior is 10-30 times to suicide . Identification and assessment of suicide risk is the main target of suicide prevention. However, there are only few opportunities for nurses to acquire knowledge about suicide prevention in the process of nursing education and training. For instance, in a Nursing Department of Medical college in Northern Taiwan, there is only one class talking about related issue of suicide prevention among all the Psychiatric Nursing lectures. In general, student nurses think they are unfamiliar with this issue and unable to assess the patients' suicide risk. Clinical nurses who have more chance to care for suicide high risk group, such as those in the Emergency Department (ED) and psychiatric ward, may still have negative attitudes toward self-harm behavior. Nurses regarded suicidal behavior as selfish, wasting of social or medical expenses, or not worthy of showing sympathy. Moreover, they may think self-harm behavior as a kind of controlling behavior, calling for attention, and difficult in caring or building therapeutic relationship. These negative thinking and emotions are both less likely to promote caring quality to patients with self-harm. It was found that psychiatric nurses tended to use verbal communication, to inform doctors about patients' suicide risk, or to give close observations to prevent self-harm act or to offer a safe environment in the psychiatric ward. But there is a lack of concept of early prevention among clinical nurses, irrespective those working in the psychiatric or medical-surgical wards. Patients who suffer from chronic illness or in terminal stage of disease in medical wards might have more suicide ideations. It might be helpful to promote the ability of suicide identification and assessment among nurses to give better caring quality for the suicide high risk population. Moreover, nurses in the ED are easily encountered with the high risk (i.e. people who had suicide attempt or self-harm behavior before). There is still few research focusing on the ability of suicide risk evaluation of nurses in the ED. It was suggested that training courses can change the negative attitude of suicide for nurses who work in the ED, promote their ability of suicide risk assessment, and enhance their confidence in facing these patients.