一、历史的使命建筑,作为一种社会文化产品,必然映射着社会的政治、经济、科技、社会人文和自然地理所赋予的时代性、地域性、民族性的典型特征。作为一部承载历史文明的史书,一定以一种物质的存在形式,诉说着曾经发生的故事,留下记忆的遗痕。作为十三朝古都的西安,是一座绵延千载的帝王之都。从城市的整体格局到传统街区,以及单体建筑,无疑也有许多遗存作为历史的见证。例如在形式层面上经纬分明、中轴对称、按九宫格的城市布局形式, I. Historic Mission Architecture, as a social and cultural product, necessarily reflects the typical characteristics of the times, regions and nationalities as conferred by the political, economic, technological, social, humanistic and natural geography of society. As a historical book bearing historical civilization, we must tell the story that once happened in the form of a material existence, leaving traces of memory. As the thirteen dynasties of the ancient capital of Xi’an, is a thousand years of imperial capital. From the overall pattern of the city to the traditional neighborhoods, as well as the single buildings, there is no doubt that there are many remains as historical testimony. For example, in the formal level of latitude and longitude, the axis symmetry, according to Jiugongge urban layout,