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During the dry-wet cycle, the soil cracks and matrix suction change a lot, at this same time, the overall slope stability should be paid attention to. Therefore, in this paper, physical model tests in two different scales were conducted to study the crack development of the dam slope and the change of the matrix suction, and then the stability of the dam slope was analyzed. The results showed that for the whole dam slope, cracks were most likely to occur at the middle part of the upstream dam slope, and cracks were most developed at this area. The matrix suction at the middle part of the dam slope was the largest. In addition, although the cracks were repaired by the rainfall, the integrity of the soil with cracks was not as good as that before the drought. The pressure of the dam slope was no longer continuous and the upper pressure could not pass to the bottom of the slope. Therefore, local landslides may occur when the upper earth pressure was increasing.