Abstract: This paper is concerned with the physico mechanical properties of lime soil during freezing process.By experiment the frost heaving behaviors of lime soil with different lime content are studied.The test results show that the porosity and hydraulic conductivity of lime soil decrease and the cohesion strength increases with increasing of lime content.Thus,the amount of frost heaving of lime soil is much smaller than that of pure soil.The optimum lime content is about 12%-15%.It is concluded that mixing of lime with soil has noticeable influence on the freezing behaviors of soil and causes a restraint on the frost heaving.