Trade and transportation are two inseparable issues in the present circumstances, due to the fact that the efficient transportation is a must for a successful trade. The transportation service companies thus make the economic cycle of the countries move by transit and transport of loads and people. The main objective of a transportation service company is gaining more profit. One of the ways to access this objective is appropriate decision- making in connection with transport of load/person. Unfortunately the transportation companies are somehow unable and limited in allocation of available resources. What is most important for these companies is participation an involvement in activities that help them to reach their economic objectives, providing more profits for the country. In this research, the criteria for selection of best projects for transportation companies are defined, by using Delphi Method. The proposed projects of a transportation company are then studies and by Bernardo Decision making Method, and taking into account the specified criteria a mathematical model for selection of better project (or projects) have been represented. The optimum response for investment in transportation companies is then proposed.