Abstract: In order to study the influence of soluble salt on the shear strength of loess, this paper takes the L1 of the original loess in Liulin County of Lliang as the research object. Take the salt content and water content as the variables, and analyze the influence of different moisture content and different salt content on the shear strength of loess. The results show that when the moisture content is low as 10%,the increase of the concentration of soluble salt ions makes the electromotive potential between the particles decrease, and make the cohesive force increases obviously with the increase of the salt content. When the moisture content is at 15%~25%,the concentration of soluble salt ions in the soil particles decreases with the increase of the moisture content. The electrochemical effect of soluble salt is weakened. As the same time, the softening effect of moisture on soil skeleton, the cohesion decreases with increasing moisture content. The internal friction angle increases slightly with the increase of salt content, and decreases with the increase of moisture content.