At present, China's second-hand car assessment system is still in the initial state, the entire second-hand car appraisal domestic industry does not have a scientific, consistent, rigorous appraisal methods and evaluation theory. Field research by author used car market, combined with their own point of internship experience in the 4S, access to large amounts of information books to understand the status of second-hand car market at home and abroad, get a lot of valuable information and data by comparing, after careful analysis , China's second-hand car market to foreign mature second-hand car market remaining large gap, the technical appraisal of the lack of practical used car standards, the lack of effective price assessment method of calculating the actual trading system can not protect the interests of consumers, Customers can not guarantee a fair and equitable purchase of vehicles and customers fair and reasonable sell used cars. In this paper, by analyzing the used car appraisal theory and evaluation methods, combined with the market situation, the transfer for the purpose of the assessment used car used car ownership changes among economic actors to study this aspect of assessment methods used car. Then, faced with second-hand car in car accident, replacement vehicles, cars and other popular prices good grasp of the issues apply their research out of practice methods for these types of models used car prices analyze an : Used car; the status quo at home and abroad; appraisal; Case Study望采纳,谢谢