This paper was to investigate the influence factors of the home-field attendances numbers of Chinese Professional Baseball League (CPBL) based on 540 games from 2000 to 2002 by Seeming Unrelated Regression (SUR) model. The results showed that the attendance numbers in home-field were significantly affected by home-filed history and holiday. On the other hand, TV broadcast and score difference of last game did not affect the attendance numbers in home-field numbers. The influences of attendance numbers by distance between teams location, the seasonal winning percentage, the home-filed winning percentage, the last season ranking at league, or precipitation did not have consistent conclusions. Our research results may provide a reference for CPBL and managements of teams.