Some overseas social work fields for the elders and cancer treatment have concerned themselves with spiritual issues and even offer spiritual services. However, seldom have spiritual issues been discussed in Taiwan's social work fields. It is accordingly necessary to discuss and conduct research on Taiwan social workers' opinions toward spiritual services, and how they have incorporated social services and the practice of social work and the difficulties they are facing. This study adopted in-depth interviews with social workers and their supervisors, seven in total, from two Christian social welfare institutions as the research subjects. Text analysis is conducted through thematic analysis.The research results show that: (a) while social workers cannot directly define the abstract meaning of spirituality, they come to realize it through concrete experiences such as interactions with service users and the empowerment gained from social work; (b) social workers offer spiritual services during the process of both counseling and referral services, and the criteria for the type of spiritual service are in accordance with the users' religions; (c) difficulties in offering spiritual services include four aspects: service users' unawareness of their own spiritual needs, their concerns about violating professional ethnics, a lack of relevant experience among social workers, and churches not functioning as expected. This research suggests that social workers try to focus more on spirituality naming during the service process to leave more room for this issue to be explored. Meanwhile, in the future, social work spiritual service training programs should be included in professional education courses or practical supervision in order to assist social workers in self-reflecting on their life and cultivating their professionalism in spiritual services.