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本文分长江三峡工程坝区及外围（约３１对万ｋｍ２）和长江三峡工程库首区（约３万ｋｍ２）两个层次和范围进行区域地壳稳定性评价与分区研究，在构造分区及现今地应力地场研究的基础上，运用模糊数学进行地壳稳定性量化综合评价，然后结合地质分析，进行地壳稳定性分区。长江三峡工程坝区及外围地壳稳定性评价与分区结果为：库首区地壳稳定性总体系属相对较稳定一稳定状态，三斗坪坝址区属于相对稳定地块；长江三峡工程库首区地壳稳定性评价与分区结果为：三斗坪坝址位于古老的花岗岩完整块体之上，属于相对稳定（Ⅰ）地块。从区域地壳稳定性评价看，三斗坪坝址是一个不可多得的好坝址，适宜修建巨型水利电力工程。
In this paper, the regional crustal stability evaluation and zoning study are divided into two levels and ranges, namely the dam area and its periphery of the Three Gorges Project (about 31 million km2) and the first area of the Three Gorges Project Reservoir (about 30,000 km2) Based on the research of the stress field, the fuzzy mathematics is used to evaluate the crustal stability quantitatively, and then the geological stability analysis of the crust is carried out. The evaluation and zoning results of the crustal stability of the dam area and the periphery of the Three Gorges Project show that the crustal stability of the reservoir head area is relatively stable and stable, and that of the Sandouping dam site is relatively stable. The crust of the Three Gorges Reservoir The results of stability evaluation and zoning are as follows: The Sandouping dam site is located on the intact block of ancient granite and belongs to the relatively stable (Ⅰ) block. Judging from the regional crustal stability assessment, Sandouping dam site is a rare good dam site, suitable for the construction of giant water conservancy and power engineering.