This chapter first describes fast urbanization of China，and the current situation of spatial distribution of urban functions，land use and urban morphology to introduce the encountered problems in urban climate and living environment，which are affected and changed by urban morphology. Secondly it gives definition of dust haze and urban ventilation so as to differentiate their relationship and to highlight the function and effect of urban ventilation and as well as the importance of air pollution source control. Thirdly，relevant policies，studies and recent implementations are reviewed. Fourthly，it is suggest to build up a comprehensive system of urban ventilation assessment from city，district to building scales to create ‘breathing cities’. Through introducing case studies in Beijing and Hong Kong，it is found that climatic-responsive design should be implemented and fitted into town planning，urban design and building design，and wind corridor plan and air ventilation assessment should be based on cross-disciplinary scientific-based urban meteorological environmental analysis and dynamic potential evaluation. And it is also suggested to adopt evaluation tools such as air ventilation assessment，climatic feasibility study and urban climatic map to get a scientific support，to identify the cause-effect mechanism between city development and climatic-environmental conditions and to develop strategies for planning implementations and decision making. Lastly，for achieving more effective results，it is suggested that other factors like identifying the priorities in professional planning activities，having stimulation and subsidies mechanism，and conducting professional training and general educations to promote climatic-responsive design at all levels should be considered and conducted.