Study On The Symbiosis Of The Old And The New In The Historical Urban Area And The Planning Countermeasures Under The Stipulation Of The System Space

System is one of the indispensable factors in the construction of ancient Chinese cities.Under the influence of political system,cultural system and construction system,a set of fixed system space has been formed for the urban space.Through the system elements such as center,axis and boundary,the urban space has been controlled,forming a stable whole.With the advancement of history and the changes of cities,no matter how the urban architecture and space environment evolves,what changes is the external form space,whose internal institutional space order maintains the stability of urban space at the deep level of structure,making history traceable.This law has also become the common feature of the current historical urban areas in China-the symbiosis of the old and the new under the regulations of institutional space.Therefore,under the regulation of institutional space,how to grasp the relationship between the "old" institutional space and the "new" form space,in order to coexist the old and the new,is a new research idea for the protection and development of historical urban areas.This paper studies the planning strategy of the symbiosis of the old and the new in the historical urban area under the regulation of institutional space.First of all,it interprets the institutional space,analyzes the concept of institutional space from the historical context,summarizes the historical origin of the formation of institutional space,including the analysis of the ideological foundation,environmental impact and the change of historical tense,and then summarizes the understanding of the basic characteristics of institutional space,as well as the rules of the control of institutional space over historical urban areas.From ancient times to now,just because of the control of institutional space,history can continue in urban space,and also provide a new idea for the protection and development of the current historical urban area--the new and old symbiotic protection ideas;subsequently,this paper studies and interprets the new and old symbiotic protection methods of the historical urban area,including the analysis ofthe new and old symbiotic concept,the analysis of the new and old relationship of the historical urban area and the history Finally,this paper starts from a case study of Xiangyang ancient city as the main research object,to study the feasibility of the development of the old and new symbiosis in the historical city under the regulations of institutional space,combing through literature research,research interviews,historical map analysis and other methods Based on the characteristics and value evaluation of the ancient city system space,select the relatively complete area of the system space in the ancient city of Xiangyang as a typical case study,further explore the feasibility of the old and new symbiosis of the ancient city of Xiangyang,and draw a conclusion that the old and new symbiosis of the ancient city of Xiangyang is an effective means of protection and development,and also provides a new and old symbiosis of the historical city in the current built environment New feasible path.