IntroductionMost urban spaces experience, over time, physical degradation or functional degradation so that they can no longer meet the needs of the people. Also, time affects the physical tissues of the city and shows its various cultural, economic and political conditions. Historically, the study of the field of improving the quality of urban space in problematic tissues has examined a range of physical, economic, managerial and social considerations. Maintaining the great cultural and historical values that lie in some urban contexts are alive and prominent through studying and planning. In addition to presenting as the culture of the people of this land, these values, as symbols of national identity, can be presented to future generations. An innovative approach, insight, and a comprehensive approach that seeks to analyze urban problems and, consequently, to provide sustainable environmental, social, physical and economic development of the planning area. One of the historical and memorable places in Tehran is the Mashgh Square Complex, which has experienced several periods of development and change from the Qajar period to the 1300s so far as the most suitable position for the establishment of state and commercial agencies, so that today there is no evidence of a military-historical field. These changes during less than two centuries long, have had huge memorials for the city and its inhabitants. Unfortunately, nowadays, the complex of Mashhad Square, in spite of landscape values, aesthetics, architecture, history and culture, is not considered a living and active urban environment in practice. Unfortunately, nowadays, the complex of Mashgh Square, in spite of its landscape values, aesthetics, architecture, history and culture, is not considered as a living and active urban environment in practice. Research questions are: 1) Why is the quality and value of historical identity of Tehran's Mashgh Square dropped? 2) How can the spatial regeneration of this urban space help? The research objectives are: Investigating the impacts of effective factors on the rehabilitation of the field complex and developing the regeneration strategies of this complex has been to eliminate existing obstacles and transform them into a vibrant, secure, high-quality, cultural-historical space. ...