对三峡茅坪溪防护土石坝的变形规律和特点进行分析，大坝内部累积沉降1.26 m，约占坝高1.21%，外部变形最大沉降205 mm，最大水平位移85 mm，坝体水平和垂直位移均呈河床大、两岸小的分布，水平和垂直位移均具有不可逆性。通过统计回归分析可知：水平位移受水压和时效影响，垂直位移不受水压影响，主要受时效影响。大坝位移速率逐年减小，但仍未稳定，大坝变形性态正常。

The regularities and characteristics of the deformation of Maopingxi protective earth and rockfill dam in the Three Gorges are analyzed in the present paper. Data display that the internal cumulative settlement of the dam is 1.26m, about 1.21% of the dam height. The maximum external settlement is 205mm, and the maximum horizontal displacement is 85mm. The horizontal and vertical displacement values in the center of the river are great while at both banks are small. It's known that the horizontal and vertical displacement are irreversible. By means of statistical regression analysis, it is found that the horizontal displacement is affected by water pressure and aging effect, while the vertical displacement is mainly affected by aging effect instead of water pressure. The displacement rate of the dam has been decreasing year after year, but is still unstable. The dam is in normal working state.