Abstract: This paper builds a database consisting of more than 10000 actors and actresses and more than 3000 movies from 2000 to 2020 in China, mainly collected from Douban, supplemented by Cateye, IMBD and Baidu. This paper focuses on gender differences in actors’ market influence. The market influence of a film is measured by it’s box office, and the contribution of an actor/actress to the box office is defined as the inversely proportional to his/her ranking in the cast list of the film engaged. Our research shows that the performances of actors are significantly better than actresses in terms of market influence, career length, and subject diversity. Moreover, the ratio of average box office of actresses to that of actors fluctuates around 0.6 each year after 2015, which is lower than the ratio of female to male salaries in the whole industry in China, showing more significant gender inequality. Further mediating effect analysis and moderating effect analysis show that the difference of career length and subject diversity are the main reasons for gender difference in market influence, and actors achieve significantly higher rewards from market influence than those of actresses given the same extent in expanding their career length and subject diversity.