Abstract: This study with the aim of making the best model for forest roads planning, at the first step examined the important factors in road construction and then categorized them according to the internal importance of each factor. GIS technique was used to make numeric form of these factors. Valuation between layers has been made according to the designing expert’s ideas, forest road construction and AHP method. Consequently, the model of road designing has been achieved. This model has been applied in GIS framework on the zone. At the next step, horizontal and vertical curves of road have been designed and corrected by system according to their placement position on the zone in GIS framework. The above research showed that with the submitted model and method in Arc GIS, there is the possibility of planning suitable road in mountain areas.