The purpose of this study was to evaluate the value of professional basketball clubs in Korea with fan support index which it calculated by drawing fans to its arena. This study would be placed for the future research of the brand equity for the baseball clubs or other sport clubs in Korea. This study was modified to the Fan Support Index which was developed by Thomas (1999) and Kim (2001). It sought the answer by developing a formula to rate the fan support by Korea Professional Basketball League franchises. This study encompassed 10 teams that were governed by the Korea Basketball League(KBL) since 2001. Each franchise`s level of fan support was rated on a 100-point scale. A high score is evidence of a team that does well at the box office despite such possible impediments as a losing record, a small market or a small arena. A low score is a sigh of a franchise that underachieves at the gate. In the result of this study, Changwon LG was the highest fan support score as 97.5 and followed by Junju KCC Basketball club of 80.5. It meant that Seoul and Busan baseball fans did not lead the booming of Korean professional basketball market. In this study, it was found that there were significant relations between home game winning percent and other factors related to arena capacity, home game attendance, winning game attendance. In conclusion, future studies should continue to examine the fan support with other professional sport leagues such as K-League(soccer).