This paper aims to clarify the character of mansions built during the Period of the Republic of China in Nanjing, by focusing on spatial composition and the exterior space arrangement of the main building. Based on the historical background of the Republic of China, historical textual research and on-the-spot investigation were carried out into the spatial composition of the mansions, 17 mansions are selected as study objects. Analyzing the two-dimensional composition of sites and the three-dimensional composition of attachments for the main buildings shows the character. The result of this research indicated that, the two-dimensional composition such as the position of mansion on its site, and the three-dimensional composition such as the position or type of attachments, not only imitates European and American residence, but also utilizes characters of traditional Chinese residence. The main building’s position and plane figure of the site on the exterior arrangement, which can be seen as a combination of Chinese style and Western style, has changed.

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This paper discusses the composition of the residential area, which was planned and built as an exclusive residential ar ea in the suburb of Nanjing, during the Period of the Republic of China, based on the analysis of the exterior space arrangement. First, there are 200 sites been chosen which are in a good state of preservation.Next, arrangement patterns are shown and clarifie d into 4 groups by studying the composition of exterior space and performing a cluster analysis. Then, characteristics of spatial a rrangement are described by examining the influence of each group upon the street construction, and compared with the spatial a rrangement of traditional Chinese residence and western residence. Finally, examine the feature of whole block through the distri bution character of those 4 groups. This residential area is composed by Western-style road system, mansion and garden, but cha racteristics of the territory and some feature of traditional Chinese residence can also be found in this area.

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This paper aims to compare and discuss the differences and similarities between the mansion and the diplomatic mission, which was built during 1912 to 1949 in Nanjing. Based on the investigation, 22 mansions and 17 diplomatic missions are selected as study objects. First will be the analysis of the site scale, the plan composition, the entrance and the active line of each site. Next will be a classify of the exterior composition of the mansion and the diplomatic mission through the decision tree. And the last part will be the comparison of the characteristics. Similarity of the scale, plan composition, the entrance and the active line can be found between mansions and diplomatic missions. And differences can be found that, missions have smaller scale with more complexes active line and entrance, and simpler plan composition. Although, diplomatic missions have lager scale, with simpler active line and outstanding entrance. And the exterior space in diplomatic missions surrounds main building with more connections than missions’. Because there were more functions, such as foreign diplomacy, government affairs, residence and sociality, were required from diplomatic missions.

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This paper aims to clarify the character of foreign diplomatic missions during the Period of the Republic of China in Nanjing, by focusing on positional distribution and exterior spatial composition. 30 countries, 51 locations of foreign diplomatic missions have been confirmed from documents. Most of the foreign diplomatic missions are located in NO.1 Residential District which is planed by《Plan of the Capital》, under the influence of district planning and social class. The characteristic of exterior spatial composition can be divided into three groups. In Group A, the main building is surrounded by large exterior space, and entrances are emphasized by portico. Medium-scale exterior space, comfortable and gracious environment which created by entrance and green space, are main character in Group B. Group C makes good use of the combination of garden and traffic line to create a livable condition in limited space.

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