As a result of energy saving and emission reduction, there is a way to reduce the weight of vehicle in order toreduce the consumption of gasoline. This paper is mainly devoted to several lightweight materials and technicalmethods in automobile applications ,and introduces a new approach to lightweight materials instead of mild steel.The use of sandwich materials in the automobile body panels is investigated in this study. It is concluded thatlightweight materials will be widely used in the automobile industry if the costs of lightweight materials are asmuch as traditional materials.