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Series of numerical simulations were conducted to investigate the effects of backyard depth to the wind environment of the atrium. In the first stage of this study it was found that the original designed narrow backyard is not conducive to induce wind flow into atrium. A CFD software was adopted to simulate the wind distribution with variant backyard depth. And the result shown, if the depth of backyard might allow the wake vortex to shed from the main house roof and formatted well then the velocity in the atrium would be increase. Not only the mean velocities were checked, also the uniformity of velocity in the atrium had be inspected. We found that the deeper backyard would increase the mean velocity contemporary . In the real situation of building sites, there might not be enough space for the backyard. In this study one more aisle was put beside the main house to check its effects . And the calculation results shown, that the two ailses will improve the flow rate from atrium to backyard even in the layout of original design and the wind environments also be improved. With this results it is evident that will also good for the natural ventilation and pollutant matter dispersed.

The paper extends its field of research to affordable housing development, which is an important people's livelihood issue in current china. This paper begins with an outline of public rental housing construction in Chongqing so called Chongqing model, in sight of universal issues in affordable housing exploitation, analyzes main contradictions about housing policy, planning and management, and proposes countermeasures from four aspects, establishing multi-level housing guarantee system, planning comprehensively and taking measures according to local conditions, emphasizing on quality and quantity to improve performance-price ratio, and updating design concepts to advocate intensive life. In conclusion, we find evidence suggesting that China should clearly understand the contingency and stage characteristics of affordable housing development, meanwhile establish all-round and whole process support policies and measures, and strengthen renovation of science and technologies. As a typical model, the exploration on contradictions and countermeasures of Chongqing pubic rental housing construction aims to provide experience and reference to affordable housing development across China form the theoretical and practical fields.

This paper extends its field of research to renovation of ordinary existing housing, the greatest characteristic of which is little personality and few styles. Distinguishing from landmark building, renovation of ordinary existing building fabric calls for highly specific approaches in planning, construction, and implementation. We, the architects develop renovation ideas and principles applied to ordinary existing housing offering our view of advocating stage renovation and knowing the real demand of the end user. Based on this view, we have chosen one typical action to discuss the efficient strategy and tactics, that cover the key areas of revitalizing community space with a focus on territoriality and sharing, improving housing function and aesthetic transformation which mainly address the integrity of facade remodeling and function upgrade, two-scale design and detail show, and adopting appropriate technology with particular emphasis on economic cost and user comfort conditions. The exploration on strategy and tactics in common renovation of ordinary existing housing aims to present references and experiences to urban residential sustainable development from both the theoretical and practical fields.