This work investigates the shifting phenomena of the funds investment style under the ranking pressure, based on all the investment funds from 2006 to 2008 in China with the statistics methods. We find that there is the tendency that the funds develop the similar investment styles, and there is quite difference between the active styles and the declared styles. The investment style drifts can be found in the funds. The market expectation and performance ranking are the important factors which influence the drifts. The changes of funds managers is a good explanatory variable about funds style drift in Europe and the United States but not in our country. In addition, this paper reveals that there is a different degree of style drifts between the top and the bottom funds in the performance ranks, and the top funds are more active in the style drift than the bottom funds. Our conclusion is, the top ranking funds execute actively under the ranking pressure which is benefit for the fund investors.