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Urban development plans are provided with a surface attitude to the economic, social, and physical dimensions of cities in Iran.. The purpose of this paper is to investigate the ecology of urban development projects in Iran. This is a case study of urban constructs with a social approach and phenomenology. The research questions are follows as: 1. What are the implications of the existing rationality for urban development projects and people living in Iranian cities? 2. What are the proper methods for preparing for implementation of urban development projects in Iran, considering the philosophical basis of thinking in Iranian society? The hypothesis is not focused on the nature of towns and cities, the plans to guide them, or not. The research method is descriptive-analytic and the information gathering is done by documentary and field questionnaire in the sample of Likert spectrum. Which is analyzed using software (SPSS). The results of the research show that the system of rationality governing the preparation for implementation of urban development plans is less suited to the existing system of rationality in Iranian society