This paper aims to solve the problem that under the economic situation, how to deal with the energy-saving objection and profit for enterprises dealing with passenger vehicle.The research in this paper mainly includes three aspects, firstly, to elaborate the theoretical basis of cost-benefit analysis and the feasibility of applying to the analysis on this issue; secondly, to sort out the optional ways of pursuing the maximum self-interest for enterprises dealing with passenger vehicles under the restriction on energy-saving objection; thirdly, to make a cost-benefit analysis on each way and come to a reference conclusion to the business decision.paperThepath choice model under the cost-benefit analysis methodisbuilt, which can assist enterprises in making a scientific choice aiming at their own fund structures, in order to seek for the highest level of profit.The core conclusionpapers can help enterprises to build routing paradigm,and can guide enterprises to make scientific decision.