The study at hand was conducted with the aim of using the system of earned value management in the petrochemical projects of Mahshahr. In terms of its objective, the project is performance-oriented and practical, and in terms of its method, it was a descriptive-survey research. The statistical society of the present research consists of the main employer, and minor contractors, experts and professional specialists in the petrochemical projects of Mahshahr at the number of 100 individuals and consensus-counting was used while the sample volume was equal to the entire research’s target society amounting to 100 among whom the questionnaire was distributed. The collected data was put to analysis by the use of descriptive statistics (average, standard deviation and the etc.) and the deductive statistics. With the results attained from the variables of the earned value management system, it became clear how one can exploit this new system as a viable tool in the assessment of the performance of the projects and specially construction projects. In addition, with the reconnaissance of the effective dimensions in such indexes as time and costs, and their relation with the project’s performance, we managed to come to a proper assessment of the performance of the project. What was brought into resolution through this research was the necessity of the application of this system in projects’ management with the aim of gaining the maximum amount of performance in time and cost dimensions. What became established in this research was the necessity of applying and putting to use the system of the earned value management in all stages of the work and, especially, such an application was conclusively demonstrated in the petrochemical projects of Mahshahr.
