As the economic developing, the demanding for various kind of medical and health caring is rising for the people in Taiwan and it lead to a more competitive medical market. The average life for people in Taiwan is getting higher, nevertheless, the population that suffering from chronic diseases is growing. However, people are expecting a considerate medical service. Therefore, how to increase the service efficiency and quality, and maintain the patient¡¦s right and further rising the satisfaction are becoming important issues for the medical institutes and the government. After the National Health Service was carried out in March, 1995, an enormous and constructive change has revealed. As the government finance has getting worse, the Bureau of National Health Insurance conducted the budget control policy in July, 2002. This policy caused the profit of medical institutes was reducing and the cost was getting higher. Besides, more and more new competitors joined this medical market, and plus, people asked for a better medical service and quality, medical institute is no longer profitable. In order to improve the circumstance, the medical institutes devoted in promoting the service quality and patient¡¦s satisfaction to maintain the fully support from the patients. This research is probe to one major medical center in South of Taiwan and to invest its medical service quality and the return willing of the patient. We released 400 questionnaires and 367 returned validly, the recycling rate is 91%. We adopted SPSS for windows 17.0 as the main tool to analyze the data and get the following conclusion: the medication environment and expectation, the process and the accuracy of diagnose, the waiting and diagnose hour, the attitude of nursing staff, the diagnose service and the return willing are all obvious. Meanwhile, the hardware and software of the medical institute, the service attitude of the nursing staff is greatly affecting the return willing of the patient. Therefore, the management of medical institute should think highly of the above sectors as main strategy to increase the return willing of the patient. And we will have better medical service.