The purpose of this study was to provide basic materials to establish theoretical framework in hospital administration field by analyzing the trend of academic studies in hospital administration field since 1990s when hospital administration studies came to be activated. For the purpose of the study, we analyzed trend of researches in hospital administration field using language network methodology on master and Ph.D degree theses related to hospital administration in Korea from 1990 to 2013. From the analysis, the followings were found; first of all, in the analysis of keywords, first, studies in hospital administration related field have been increasing since 1990s, and the most studies were made between 2000 and 2004. Second, there were many empirical studies analyzing the behaviors(job satisfaction and so on) of hospital workers in hospital administration related field. Next, in the trend of studies related to hospital administration through language network analysis, between 1990 and 1994 there were many studies on organization, human resources and health medical services and most of them used survey as research method. Between 1995 and 1999, there were more studies on hospital and administration and the main stream was case study. On the other hand, between 2000 and 2004, behaviors of hospital employees were mainly studied. In other words, there were many studies regarding job satisfaction, stress and satisfaction level. In other aspects, there were also many institutional studies such as current status of health, improvement methods and regulations. From 2005 to 2009, mainstream of the studies was perception and attitudes of workers and job satisfaction of workers in hospitals and other medical institutions. Additionally, studies on medical service and medical payment appeared in this period. Finally, between 2010 and 2013, most of studies were empirical studies just like before but the focus of the studies was shifted from behaviors and attitudes of workers in hospitals to customers. In other words, studies on behaviors and attitudes of patients increased. Especially, studies in various fields such as local residents, policy, health and medical service governance, ethics, customer‐orientation, and integrated medical services have gradually appeared.