高山、江河和地质问题是三峡地区城镇发展中主要的环境制约因素。移民迁建前；库区城镇的结构形态从集中紧凑的“团状”演变为集中紧凑的“带状”，它是最常见的城市形态。迁建后城市建设用地的地形条件普遍有所恶化，但地质问题大多得以改善；长江大桥的建设使库区城市能够突破江河的制约；寻求新的发展空间；“带状”组团式是城镇迁建后最普遍的城市形态。新城市日后的空间形态将受到新的环境的影响，“团状”和松散“组团式”是两种可能的发展方向。 Alpine, rivers and geological problems are the major environmental constraints in the development of the Three Gorges area. Before the resettlement of immigrants, the structure and form of cities and towns in the reservoir area evolved from a compact “clumpy” into a compact “ribbon”, which is the most common urban form. After the relocation, the topographic conditions of urban construction land generally worsen, but most of the geological problems can be improved. The construction of the Yangtze River Bridge can make the reservoir cities to break through the constraints of the rivers and seek new development space. The most common form of city after the establishment. The new urban space form will be affected by the new environment in the future. The “clumpy” and loose “grouping” are two possible directions for development.