通过６种膨胀岩的湿化过程观察和机理研究，从试验和理论两方面探讨了膨胀岩的湿化性，并与膨胀性和裂隙性进行了区别。湿化性对堑坡稳定性，尤其是表层溜坍的影响，主要体现在ｃ，φ值随吸水率的增加而降低上。理论计算的溜坍体厚度与锥贯入试验确定的强湿化层厚度相同，说明湿化性是造成堑坡溜坍的主要原因。 Through the observation of wetting process and mechanism of six kinds of expansive rocks, the wettability of expansive rocks was discussed from both experimental and theoretical aspects, and the difference between expansiveness and fracture property was discussed. Wettability of the stability of the cutting slope, especially the impact of surface slip, mainly reflected in c, φ value decreases with the increase of water absorption. The theoretically calculated thickness of the slump body is the same as the thickness of the strong wetting layer determined by the cone penetration test, which indicates that the wettability is the main reason causing the slopping of the cutting slope.