The paper adopts from the investment behavior theory and studies the affecting factors of financial investors in investment decision-making and the investment fund behavioral deviation. At the same time, the thesis also analyzes the efficiency of asset allocation and investment behavior of China's securities investment funds, and studies its impact on China's securities market. On the basis of this, it also uses LSV model to test the Fund's herding behavior, the investment behavior of the deviation and its effect on China's market orientation. At the last, it proposes some suggests and points out the paths and strategies on correcting investment behavior deviation of China's investment fund.