The properties of expansive soil have many changes after it is mixed with lime. This paper is based on the testing data of the lime mixed expansive soil from the expressway of Yichang-Jingmen. The changes in the engineering properties of expansive soil mixed with lime are obtained. It decreases the free swelling ratio, swelling capacity, shrinkage ratio and plastic index. It increases the shear strength and CBR. The research result can provide accurate testing data for improving the engineering properties of expansive soil in order to satisfying the requirements of the expressway engineering design.