Purpose: The purpose of this study was to identify the characteristics of life-sustaining treatment and attitudes towards advance directives among geriatric patients. Methods: The elderly participants (N=146) were recruited from a university hospital from October 30, 2012 to March 31, 2013. A questionnaire for collecting data of participants’ characteristics, their experiences related to life-sustaining treatment, and attitudes towards advance directives was used. The data were analyzed using SPSS WIN 17. Results: Most participants (84.9%) were in favor of advance directives. Although most of participants wanted to receive CPR for sudden cardiac arrest (78.8%) and pain control medication (74.0%), most preferred to refuse life-sustaining treatments such as tracheostomy (96.6%) or ventilator (87.0%). Participants who had a family or acquaintances with CPR experiences (U=852.00 p=.038), had discussed with their family and acquaintances regarding end-of-life sustaining treatment (t=2.91, p=.004), or made decisions about refusing the life sustaining treatments (t=3.19, p=.002) preferred to have advance directives than those who did not. Conclusion: The findings of this study suggested the potential benefits of educational programs about advance directives for the end-of-life for geriatric patients to make decisions for life-sustaining treatments in advance.