This study analyzed the trend of relationship between hospital departments. Hospitals directory issued by Korean Hospital Association in 2009 was used to collect the study sample data. The study sample used 188 hospitals established during the four years from 2005 to 2008, and bed size, establishment year was identified in the directory. Population variable in 2009 was taken from the website of Statistics Korea. SAS 9.2 was used for the statistical analysis. In regression analysis, year of establishment (2008) was statistically significant in explaining the number of hospital departments. Hospitals established in 2008 showed significant positive number of department than other years. Study hospitals showed increasing number of hospital departments during four years. Further study will be needed to analyze the effects of hospital departments on their performances.