Today, the time-consumingprojects, the desire for fast operation and increased competition in the market, haveincreased the employers' desire to reduce project time. Therefore, recognizing different approaches and techniques of time reduction is essential. The main objective of this research is to obtain an appropriate method for applying time reduction techniques in construction projects to make optimal use of these techniques. As a result, in this research, we tried to propose the most effective solutions for industry use by careful examination of the ways to reduce project time. This applied research consists of two stages of library studies and field survey, and then the combination conclusion of the library studies and field surveys. The fuzzy hierarchy method has been used to model and to identify the optimal solutions. In order to improve this research, a case study and interview with employers, consultants,and contractors of Tehran municipality projects were carried out to collect reliable answers. The statistical population of the research includes all the Tehran municipality projects. Then, the most effective strategies were identified by accurate and up-to-date fuzzy analyzes. The result shows that the economic and financial problems and bureaucracy of the offices are the underlying causes ofdelay inthe construction projects in the Tehran municipality.