Due to the development of technology and medical treatment, the number of the aged is getting more and more. Besides, since low birth rate transforms the function of families, the recognition of raising children to caring the aged was changed, independence of the aged increases and the demand of living with children decreases. Therefore, more and more the aged choose to live in nursing homes to spend the rest of their life. Regarding this social trend, service quality becomes a criterion when the aged are choosing nursing homes. The purposes of this study are: to apply Analytic Hierarchy Process (AHP) to evaluate consideration factors of service quality; to get the weight and priority of each factor; to realize the service factors nursing homes provide and which the aged attach importance to and to offer better living and leisure environment for the aged.