The classical APT model is of the form rj − E(rj) = βj(I − EI ) +εj , where rj − E(rj) is the earning deviation (called basic variance-profit) of the security j, I is a common factor. This paper considers the impact on the securities return caused by the skewness and kurtosis of the stock returns distributions, and poses a re-modified the arbitrage pricing model as follows rj= E(rj) + βj(I − EI ) +θj(I − EI )^2 +λj(I − EI )^3 +δj(I − EI )^4 +εj

Based on the regression analysis method, and the fitting degree, one can arrive at this re-modified model has a more reasonable explanation level for securities pricing.