It is quite often to notice an over-scaled public space in new urban district.As the key project,the public space in new urban district is expected to meet the multiple needs of promoting investment, attracting population and compensating the insufficient public space of old urban district,which is a hidden risk for the development of the new urban district in the long term.This paper is to propose working principles for a balance of different interests by analyzing the reasons of over-scaled public space.Targeting the planning and design of Chongqing Xiyong Central Plaza,this paper will explore the ideas,technology roadmaps and strategies for planning and designing a large-scaled public space in the new urban district, and also summarize its general methods.It’s expected that it will guide the planning and design of large-scaled public spaces and its improvement,and provide references for similar projects.