Qianlong Jingcheng Quantu, the oldest map of Beijing in the Qianlong period (1750), pictures the various institutional facilities and Beij ing-courtyard houses called Siheyuan in the Inner City of Beijing. The street block which form the whole plan of Beijing are different district by district though they are considered to follow the strict grid pattern. This paper discusses the relationship between neighborhood units and the distribution of wells, gates and small religious temples. Firstly, we distinguish the order of neighborhood units based on the analysis of a literature written in Japan, and then considers the connection of the street blocks and its related facilities. Our previous paper launched the basic model of street block division. We think our hypothesis becomes more valid. This research discusses transformation process of the Beijing-courtyard residences, with following analysis on courtyard subdivision development. This paper aims to illustrate the historical formation and transformation of physical residential environment of Beijing, and to propose a guide to the historic architectural- and environmental conservation.
