"The purpose of this study was to analyze watching style and marketing characteristics differences of the gender and ball-park sport in professional Baseball spectators. To achieve the purpose of study, a total of 789 people who were spectating the game were selected as subjects by convenience sampling method. The results of survey were as follows. First, there were significant differences between sex in terms of using and visiting types of ball-park by baseball spectators; team preference, preference reasons, companying people, transportation, preference transportation, amount of expenses, reasons for spectating, and suggestion for development of Korean professional baseball. Second, there were significant differences among ball-parks in terms of using and visiting types of ball-park by baseball spectators, except two factors, ""reasons for buying"" and ""experience of baseball supplies"". Third, there were significant difference between sex in terms of marketing attributes; entrance fee, parking convenience, product price in the stadium, food price in the stadium, and rival team. Fourth, There were significant difference among ball-parks in terms of marketing attributes; parking fee, food price in the stadium, kinds of food in the stadium, rival team, head of cheerleaders, price of cheering tool, and record of spectator's team. Key words : professional Baseball, sport marketing, Baseball, marketing characteristics, watching style"