With the aim of protecting expansive soil slope, four kinds of protective schemes were chosen for laboratory model tests, including geo-membrane covering, sand cushion bedding, sand layer covering, and replacement with cement-treated soil. Drying-wetting cycles were carried out for slopes with different protective methods. During the cycles, the deformation of expansion, the development of cracks, and the variation of moisture content were monitored and compared among these slope models. The effectiveness of each protective method and corresponding application problems were discussed. The results show that the method of replacement with cement-treated soil is the best of these four methods. Furthermore, for geo-membrane, attention should be paid to processing the joint between two pieces of geo-membrane. For the method of sand cushion bedding, the thickness of the sand cushion should be adjusted according to the climate conditions. The sand layer covering should be taken as a supplementary measure rather than being used independently. When the method of replacement with cement-treated soil is used, attentions should be paid to guaranteeing the thickness, controlling the degree of compaction, and doing careful maintenance work.