在城市化发展进程中,如何对待大中城市中的历史遗存街区已成为一种普遍的问题.在保留这类物质形态原有风貌的方式中,如何处理开发与保护之间、形态与功能之间的矛盾是其中的关键课题.为避免城市建设与城市管理的脱节、宏观整体与微观局部的冲突,需要制定和完善一系列的保护实施保障方法,来营造一个优美、和谐、高效的城市空间.本文以杭州市小河直街历史街区的改造为例,从规划与建筑设计角度探讨具体的保障实施方法. In the process of urbanization, how to deal with the historical relics in large and medium-sized cities has become a common problem.In the way of preserving the original appearance of such material forms, how to deal with the differences between the forms and functions of development and protection In order to avoid the disjunction between urban construction and urban management and the macro-overall and micro-local conflicts, it is necessary to formulate and improve a series of protection and implementation methods to create a beautiful, harmonious and efficient urban space Taking the reconstruction of the historic district of Xiao He Straight Street in Hangzhou as an example, this paper discusses the specific implementation methods of guarantee from the perspective of planning and architecture design.