Based on the statistics from the Chinese Professional Baseball League (CPBL), this paper tried to estimate the demand for attendance at CPBL games, and then investigate the factors affecting attendance. The empirical results showed that the effect of new stadiums on annual average attendance was negative possibly due to inconvenient traffic or game schedules. The gambling and two-league competition events would reduce annual average attendance. The empirical evidence also implied that the quantity of stadiums was quite enough to satisfy the demand for professional baseball games in Taiwan, but facilities of stadiums should be improved to raise the quality of games.