Infrastructure and development projects in any country constitute the infrastructure and development of that country. In the implementation of these projects, financing is an important and primary concern due to the lack of infrastructure and infrastructure in the country on the one hand and the lack of capital resources on the other hand, capital has an undeniable role in this. Financing projects is one of the most common investment methods in any country. Undoubtedly, how and how to finance the projects for each level of existing institutions depends on the nature of the project. Paying attention to financing has a high share in solving the problems of financing and launching projects. Therefore, the purpose of this study is to rank the methods of financing from external sources in construction projects. The present study is applied in terms of purpose and descriptive-survey in terms of the nature of the method. In order to collect data, a questionnaire based on multi-criteria decision making method (network analysis method) was used, which was completed by five senior financial engineering experts with at least 10 years of experience in financing projects of construction companies in the west of Tehran. The collected data were analyzed by Super Decisions software. The results of financing ranking showed that international loans with a relative weight of 0.314 ranked first, BOT contracts with a relative weight of 0.21 and finance with a relative weight of 0.171 took second and third place. Findings of the study show that in general, the criterion of higher rate of return with a relative weight of 0.64 than the criteria of lower risk with a relative weight of 0.26 and a ceiling of more funds with a relative weight of 0.1 is of higher importance in financing from external sources in the project. Have civil engineering and should be given more attention.