One of the effective strategies for achieving sustainability and creating interaction between the “conservation and development of urban heritage” is to maintain “integrity” in historic cities. The definition of integrity, in relation to the definition of the special values of urban heritage, is important. Reviewing international conservation documents and conventions, as well as relevant theoretical perspectives, indicates that the evolution of the concept of integrity has been the result of both sources, with an emphasis on the principle of conservation and the conservation of heritage significances. It then becomes associated with the concept of “authenticity” in convey of significance, and ultimately aligns with the concept of sustainability and sustainable development in "conserving significance " and "transferring significance." The present study aims to explain and recognize the relationship between the concept of integrity and the sustainable conservation and development of urban heritage. Therefore, the approach of this research is fundamental, and the dominant strategy is content analysis, in order to provide a conceptual framework that, on the one hand, focuses on the concept of integrity and the conservation and convey of heritage significances over time, and on the other hand, ensures the secure and convey of significances to future generations through the concept of sustainability. Therefore, the concepts of "convey significance “and “conservation significance" are vital and essential in the process of sustainable conservation and development of urban heritage.
