Researches on librarians' job satisfaction in Korea have been conducted for nearly 40 years. However, it is difficult to find the criteria that specifically evaluate librarians' job satisfaction, and most of the studies have used evaluation criteria developed oversees a long time ago. For these reasons, it is necessary to investigate how librarians' job satisfaction levels have been measured. A total of 68 theses and dissertations were reviewed by dividing period into 10 years backwards from 2016. The chronological changes and trends of evaluation factors were examined and differences were sought among types of libraries. As a result, it was confirmed that there were various changes in the evaluation factors. A standard indicator consisting of 12 evaluation factors and 39 items was proposed by applying three principles that the criteria should reflect factors, questions, and current status.