Abstract: Some of environmental impact assessment (EIA) objectives make available by Economic Valuation (EV) techniques like Contingent Valuation Method (CVM). EIA has not included EV techniques yet in Iran. Present study is the first attempt of using CVM as an EV technique in the EIA. We chose CVM because it can estimate all of values. It replaces with cost benefit analysis (CBA) in EIA procedure. Tehran-Shomal freeway is our study site. It has 121 km length which joins Tehran as Iran capital to Chalus as a tourism city in the north of Iran. Tehran-Shomal freeway also, is a part of the International North-South Transport Corridor (INSTC) connects eastern Asia to Europe. As the NGOs and people are seriously concern about environmental degradation, the project has been faced a strict challenge and has not completed yet. The CVM can replace with CBA in the EIA procedure and a get a logic response for present challenge. Total WTP was US$ 77.23x106 after running a Logit model for supporting natural resources along Tehran-Shomal freeway. If we compare WTP with the cost of Tehran-Shomal freeway, we will find the completion of freeway construction has explanation from economic view point.