| Active aging and healthy aging have become a widespread concern in the international community.The purpose of building a health-promoting outdoor space environment is to adopt the elderly-oriented update method combining "passive" and "active",from the multi-perspectives of material environment and social environment,and take the promotion of residents’ health as the fundamental starting point,and reduce the material or non-material barriers that the community environment brings to the elderly through outdoor space planning,design strategies and social environment construction,so as to ultimately achieve the goal of home-based community elderly care.Although domestic and foreign scholars have proposed relevant concepts and specific evaluation indicators for healthy cities and healthy communities,and actively introduced health-promoting planning and design methods in urban planning and outdoor space construction,however,the research on health-promoting outdoor space environment based on population aging is still relatively lack of theoretical and practical systematic research.This study selects Chengdu,a city with severe aging in China,as the research area,taking the representative outdoor environment of the existing community as the research object,taking the health promotion space environment construction as the entry point,and analyzing the correlation of the outdoor space environment and the health of elderly,establishing a health-promotion outdoor space environment evaluation index system,taking the typical community as an empirical evaluation,and proposes the health promotion strategies under outdoor space environment of the urban built communities in Chengdu.The research results can make up for the shortcomings of the theory and practice of health promotion research in the urban built community renewal field,provide new ideas for urban renewal,and have important theoretical and practical significance for improving the quality of outdoor living space environment in the home-based community elderly care and alleviating the stress of China’s elderly care space.The research results are as follows:(1)By analyzing the effects of outdoor space environment on physical activity,travel behavior and physiological and mental health,this study indicated that the characteristics of outdoor space environment and the quality of physical activity facilities significantly affect the user’s physical activity.Compared with young people,the elderly are more dependent on the friendliness of the outdoor travel environment.The outdoor space environment is closely related to people’s physical and mental health.The safety,accessibility,comfort and aesthetics brought by the outdoor space environment are important factors in the construction of health-promoting environmental space.The construction of a health-promoting outdoor space environment has played an important and positive role in addressing the aging process.At present,China’s elderly care model can be transformed from passive response to active intervention,to improve the health of the elderly,and promote the healthy development of cities and communities.This study proposes a conceptual model of "six-in-one" health determining factors,which consists of individual,political,economic,cultural,social,and ecological factors.At the same time,the concept of health threshold and health value loop was introduced,and a linear model of health value was established.The combination of qualitative and quantitative methods fully clarifies the correlation between various factors and health.(2)Defining the outdoor space environment health promotion mechanism is the foundation for building a health-promoting outdoor space environment.The outdoor space environment mainly affects people’s health through two mechanisms:First,the individual’s subjective evaluation of the outdoor space environment affects their behavioral activities.The sense of security,convenience,comfort,and attractiveness brought by the outdoor space environment will affect people’s choice of places,eating habits,physical activities,travel modes,and social interactions.Second,the objective outdoor space environment conditions affect people’s behavioral activities and their opportunities and capabilities accessing to the resource environment.The resource environment includes environmental elements such as air,noise,light,water,temperature,humidity,and wind speed.It also covers road transportation facilities,public service facilities,green space,food acquisition,social capital,and energy consumption.The resource environment and the intrinsic ability of individuals together determine the extent to which individual functions are exerted.Individual differences in the abilities of behavioral activities and obtaining resources and environment will have different health problems and corresponding health outcomes.(3)Constructing a health-promoting type outdoor space environment evaluation index system is a key technology for constructing and implementing a health promotion environment dynamic mechanism.This study constructed the target layer(A)through the Analytic Hierarchy Process(AHP);Five criteria layers including natural environmental quality(B1),land use quality(B2),traffic environmental quality(B3),green space quality(B4),management and maintenance(B5);Fifteen sub-criteria layers of three-level indicators;Forty eight health-promoting outdoor space environment evaluation index systems for evaluation indicators at the four-level index.Through calculation,the comprehensive weight of the "air" indicator is the largest,which is 0.27;the "availability" indicator is second,which is 0.13.(4)Using the constructed evaluation index system,the outdoor space environment of the built communities in Chengdu was investigated and evaluated.The survey found that Chengdu has different levels of problems in the natural environment,land use,transportation environment,green space,management and maintenance.This study conducted a comprehensive evaluation of the outdoor space environment of No.241 Shuang Nan Road,with an evaluation score of 71.9 points,which is a medium health promotion level.Based on the evaluation results,specific optimizing measures are proposed including the combination of "stereo parking" and "community greenway",mining "stock space" and actively expanding new green space.(5)The built communities of Chengdu has obvious features of aging,showing the characteristics of aging and empty nesting,and the economic and health status of the elderly population is poor.The types of outdoor activities that the elderly participate in include fitness,entertainment,health,and society.The main space for outdoor activities for the elderly is the spaces between dwellings and activity venue inside the community,with a ratio of 72.5%.The daily outing activities are concentrated between 7:00-10:00 after breakfast and 15:00-17:00 in the afternoon,showing a high frequency of participation.The elderly residents in Chengdu urban existing community have a satisfaction rate of 54.5%for the community’s outdoor space environment.They are dissatisfied with the lack of activity venues,public toilets and seats.This indicates that the elderly have greater demand for seats,public toilets and fitness facilities.Based on this research,this paper proposes to sort out outdoor space types,mining the potential of stock space,improve outdoor space quality and meet the needs of different groups;build outdoor space system and increase space dynamics to accelerate the three outdoor space optimizing strategies.(6)Starting from the main factors affecting the impact of the previous evaluation,the paper proposes the health promotion strategy of outdoor space environment in the urban built communities including five aspects,improving the air quality,building the farmer’s market,shaping the inclusive streets,developing the assembled outdoor space and promoting horticultural therapy. 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