Background: In the competitive environment of medical service system, the management of medical institutions increasingly difficult, patient's satisfaction is an important factor for seeking medical care in loyalty, it is necessary to be clarified. Purposes: The purpose of this study was to explore the relationship of satisfaction of outpatient services and background to seek medical care at a regional hospital in Taipei. Methods: This is a cross-sectional descriptive design. The instrument was structured questionnaire. Professional validity CVI 1.0, pre-test, face validity, content validity was implemented. Out-patient service satisfaction scale Cronbach's α 0.93, sub-scales were 0.89, 0.92, 0.80 respectively. A purposive sampling consisted of 590 people at a regional hospital in Taipei was conducted between July and August in 2005. Results: The participants mean satisfaction was 3.67 (SD = 0.51), that show participants felt between satisfaction and normal range. The patient satisfaction subscales of service attitude were ranked highest in the satisfaction of outpatient services(3.72, SD= 0.55), followed by environment satisfaction(3.67,SD=0.58) and satisfaction of the waiting time(3.58, SD= 0.69). The marriage, occupation, the well medical equipment of hospital and good service attitude, skillful were significant factors to affect their satisfaction. Conclusions/Implications for Practice: To enhance the well equipment of hospital, the service attitude and skillful will elevate satisfaction of out-patients. The result of this study could be used as a reference for improvement outpatient services.