With the exploration of the value and sustainability of developing Urban Agroecology for application to urban development processes, the central question that will be extended and studied in this dissertation is, therefore, how can Urban Agroecology offer new possibilities for sustainable urban development? This can be deeply meaningful for agricultural civilisation contexted cities' problems solving and future development. Shanghai and Lima are case cities analysed, have been through and are now experiencing some exciting urban eco-building projects. They are urbanising at a fast pace with the global trend; both face complex urban development challenges while still needing further to consider potential and possibilities for further sustainable development and find the right questions during the application of Urban Agroecology. Urban space will be given a new functional definition in the future. The theoretical areas on which this dissertation will focus are the value of developing Urban Agroecology and approaching it sustainably.