The paper aims to quantify the phenomenon of sexual harassment on campus, which based on the gender statistics from Taiwan's government, and use grey entropy model in grey system theory as the major mathematics model to analyze the problem of sexual harassment on campus victims from year 2007 to year 2012. The paper based on the past researches to proposes five influence factors for the sexual harassment on campus at first. Then, through the grey entropy in grey system theory to calculate the weighting for each influence factors. Finally, the result shows that the main factors influence sexual harassment on campus for male victims are senior high school students; while for female victims are primary school students. It is quite matching the real satiation in Taiwan.