A feasibility study of the indoor test of the Yunnan laterite landslide was carried out under simulated rainfall conditions. In the study, the modeling material, the Yunnan laterite, was used to make lateritic slopes, and the effects of the size of the slope, the lateritic properties, the molding method, and the rainfall level were all considered. The tests results show that, the success rate is low if a laterite is directly selected for the indoor test. However, a lateritic slope landslide may occur if the test conditions are well controlled. Under the conditions of indoor rainstorms, the sliding process of the lateritic slopes can be divided into the following stages: the formation of the slope, the implementation of rainfall, the formation and development of the sliding surface, and the overall slide. The sliding characteristics can be expressed as cracking and sinking on the top of the slope first, and then cracking and extension on the sides of the slope. The conditions for sliding include larger values of the height and angle of the slope, a moderate width of the slope top, a lower plasticity index, a lower dry density, a moisture content of approaching the plastic limit, the stacked molding method, and a rainstorm.