Scraped automobile is a kind of renewable resource with multiple value of development and utilization and variety of resources are used to make a car, such as iron and steel, non-ferrous metal, plastics, glass, rubber and so on, which can be recycled at the end life of vehicles. On the basis of learning the properties of recycling materials of scraped automobiles the paper makes a quantitative analysis on the possible maximum profit and conditions by constructing a decision-making model for automobile producers, which shows that no matter which kind of recycling mode the manufacturer chooses, the profit function is only related to four factors.