The work aims to deeply investigate the attitudes of people of all ages towards the public space of smart cities, to provide practical suggestions for future urban planning and design, and promote urban development towards a more inclusive, interactive and sustainable direction. Firstly, through the data collected by field investigation, needs and behavior characteristics of different age groups were analyzed, and corresponding design strategies were put forward. Secondly, geographic information system (GIS) technology, building information model (BIM) software, virtual reality (VR) rendering technology, etc. were applied to achieve spatial visualization, simulation and interaction. Finally, through the application of these technologies, real-time monitoring, data analysis and intelligent management of urban public space were realized to provide a more convenient, safer, and more comfortable environment. The design of smart city public space fully considers the needs and abilities of people of different ages, and creates a public space that is safe, comfortable, convenient, interesting and socially interactive. The design of smart city public space from the perspective of all-age friendliness requires the comprehensive use of various technologies and software to realize the intellectualization and humanization of space. Through in-depth analysis of related technologies, it can provide a scientific basis for urban planning and design, and create a more livable, industry-friendly and tourism-friendly urban environment.