Being informed of each city's spatial structure can increase its planners' success and significantly help in modifying urban environments. Urban development plans, especially comprehensive ones, are among the most influential factors in the spatial structures of cities. Because the outcome of the spatial structure of a city is almost determined in these plans. Therefore the spatial structure of comprehensive urban development plans based on the City's characteristics has been analyzed in this research. Studied components were analyzed in three main areas, including "spatial features," "functional features," and "physical features" in three comprehensive plans of Tehran (approved in 1968, 1992 and 2007). The research methodology is "applied" in terms of purpose, "descriptive-analytical" in terms of research method, and "evaluation" in terms of content. Library and survey methods are used for Information gathering. The results showed that from the first to third comprehensive plans have proposed different spatial structures for Tehran, which are respectively: linear structure, radial structure and network structure. Tehran had scattered and irregular growth in the 60s and 70s of the solar calendar because of not realizing the proposed structure and strategies of the first and second comprehensive plans. In general, it can be said that the comprehensive plans of Tehran intended to create a city with a polycentric structure.
