This study is to analyze the characteristics of golf course water usage using groundwater and rainwater data obtained from 17 golf courses in Jeju Island during 2007~2009. The groundwater usages were 246,275 ㎥/year, 213,062 ㎥/year, 155,235 ㎥/year, and 126,666 ㎥/year in the west, south, east, and north regions, respectively. Monthly rate of the amount of groundwater usage to the amount of permission was 29.5%. The rainfall usages were 386,591 ㎥/year, 326,464 ㎥/year, 251,248 ㎥/year, and 232,061 ㎥/year in the south, west, east, and north regions, respectively. Monthly rate of rainwater usage to the amount of water retention of golf courses was 19.6%. The average annual water usage in the 17 golf courses was 499,377 ㎥/year. From the average usage, it was found that the rainwater usage (305,126 ㎥/year) was 1.6 times higher than that of groundwater (194,251 ㎥/year). That means the annual average rainwater usage to the entire water usage was 61.1%, which was above the criteria of 40%.