中文摘要：

居住环境是包括安全、保健、便利、舒适和可持续等物质和非物质要素的综合体,其优劣不取决于孤立的某一方面,也难以在任何地区都使用统一的数值标准。拥有作为城市高等资源的文化遗产是我国历史街区居住环境的最大优势,遗产保护导致的市政设施标准和舒适度上的轻微降低是公平和可接受的,为达到某种统一指标而破坏遗产的行为是绝对禁止的,这就是历史街区市政技术的＂适度差异＂原则。

英文摘要：

As a complex of material and nonmaterial factors including safety, health, convenience and sustainability, residential environment cannot be defined by one factors isolated from others, and cannot be unified as fixed figures applied to all areas. Because residential environment of historic area has a huge superiority of cultural heritage, the advanced urban resource, it＇ s fair and acceptable to slightly lower its convenience and infrastructure supply standard. This is the principle of acceptable deference for infrastructural supply in historic area.