Studying Documents of International Organizations on Design Approaches in Historical Districts in the Contemporary era

Adding a new structure to the historic district is one of the methods of urban conservation that needs more cautious compared to other methods. In this regard, international organizations have addressed this issue in documents. which until now, has been investigated and analyzed less precisely. So, in this research, for the purpose of design formulations, what they are is followed up. So, by studying the documents, the required data were collected and based on the theme and structure of the design, were summarized in three levels of attitude, approach and method. Then, with the help of comparative comparison and SPSS, the design approaches are described. The collected data show that three design approached have been proposed so far. In the first, presented in the Venice Charter, the Washington Charter, the Charter of the Principles of Review, Conservation and Structural Restoration of Architectural Architecture, the New Zealand Charter and the Bura Charter, historic district as document is preferable. Therefore, it is recommended to not change and homogeny. In the second, presented in the statement of Tlaxcala and San Antonio, historic district is seen as a document and a part of a city. Therefore, it is recommended to manage change and harmony based on traditionalism. In other documents, despite the similar attitude and approach, it has been recommended to harmony with regard to characteristics of district and contemporary expression with compatibility with it.