Energy is one of the most important issues of the world today. Given the limited energy resources and the increase in the prices of energy carriers in Iran, identification of methods and solutions for supplying resources and energy consumption in the energy and energy industries such as transportation is very necessary. In this regard, due to the rich natural resources of the country and the government's investment in this sector, the importance and role of compressed natural gas (CNG) as one of the best gasoline alternatives in cars in the past years has been identified. On the other hand, due to the role of various factors in economics, politics and society in the performance of this industry, policy and planning are associated with particular complexities. Hence, in this paper, a systematic approach is proposed to provide appropriate solutions for the development of optimal use of compressed natural gas (CNG) instead of petrol as a fuel for the road transport sector based on the important impacts of this industry and their effectiveness on the basis of the dynamic system Designed and decomposed. An approach that involves and interacts with all the factors involved, as well as adopting a glimpse into the compressed natural gas (CNG) industries in the transportation sector, provides appropriate solutions for the development of an appropriate economic system. Accurate and timely information, creates a long-term program for the fuel basket, Suitable fuel prices, the proportions of the growth of Duncan cars with compressed natural gas (CNG) supply sites, are known as effective development variables in use of compressed natural gas (CNG) instead of gas is known in Iran's road transport system. Finally, make the necessary and effective suggestions based on the systematic analysis to create a growing trend to government officials and policy makers.