Despite the fact that time and space are two dimensions of a city,most studies and practices focus on space and yet ignore time since modern times.Responding to this deficiency,this paper reviews the evolving thoughts on time and space in the domain of urban design.We demonstrate the paradigm shift from a long-term historical view to daily life.The time-based urban design toolkits are summarized on basis of the structural dimensions of time that are proposed by Kevin Lynch,namely,scale,periodicity,amplitude,speed,synchronicity,regularity,and tendency.In addition,this paper reveals how time-based urban design can use strategies such as insertion,filling,and time delay to optimize and synchronize the temporalities of place.All findings of this paper are to provide theoretical and practical support for urban design to realize the time turn.