The policy on enterprise taxation is an important issue, but the effect of corporation taxation is various in different contexts. Based on the data from 106 creative groups in Jiangsu province, this paper establish an econometric model to explore the impact of creative firm's taxation and size on its productivity growth. It turns out that both the taxation reduction and firm size in the creative sector present a significant and positive effect on its productivity growth, while the growth effects caused by reducing taxation is much less than by enlarging firm size. It also shows that the interaction effect of taxation reduction and firm size is turned out to be significantly negative, indicating that the the productivity of creative sectors will be increased more substantially in the context of taxation reduction as the size of creative firm enlarging. The robust analysis by the Tobit and panel data regressions both support that our empirical results is consistent and valid. This paper not only can facilitate the theory of industry development but also provide a new implication for increasing the productivity in creative sectors.