This study mainly put emphasis on the teams' brand images of Sinon Bulls professional baseball team of Chinese Professional Baseball League, and creating a team image scale for Taiwanese professional baseball games. I used the "Sinon Bulls team's images questionnaire survey" and purposeful sampling to examine the on-the-spot fans in five ballparks between April 29 and May 12, 2010. We sent out 450 questionnaires in the main baseball stadium and there were 397 effective questionnaires with an effective response rate of 88.2 percent. The data gained from the questionnaires were evaluated by descriptive statistics, independent samples t-test, one-way analysis of variance and structure equation model. The results were as following: 1. There were four dimensions on team image for on-the-spot fans including 1) Game Performance, 2) Commercial Marketing, 3) Caring Behaviors and 4) Values Orientation. 2. The team image scale was found having good model fit. There were significant differences on team image for on-the-spot fans among gender, age, education, career, and the duration of support etc. There were more marketing implications discussed in the study to assist the team identification, the higher purchase intention fans increased by perceived value. In conclusion, the team image scale for Professional Baseball games fits the empirical study and has good reliability and validity. However, further studies are required in this regard.