Abstract: Gas stations as parts of the urban infrastructure are the basis for the normal operation of social economy. They are also signs of the development of urban modernization. The quantitative analysis of the service capacity and service area for a gas station is an important guarantee of planning and constructing gas station retionally. In the paper, the distance attenuation theory was introduced and the relationship between service capacity of a gas station and space distances was analyzed. The attenuation coefficient that affected the results of the analysis was studied. Finally, taking the Tangshan towns gas station in Jiangning District as an example, the quantitative analysis of service capacity of the gas station was carried out and proposed an optimization strategy. Research results indicated that:the mothed could reflect the impact of distance decay on service capacity and scope of a gas station. And it could accurately draw the status of service capacity and service area for existing gas stations. This method was more accurate than the traditional service radius method. It could provide reference to rational planning and construction for the gas station