At present，the used automobile e-commerce platforms have been reconstructing the traditional transaction by the internet technology.The ability to process the big data directly affects the progress of the transformation and upgrading of the used automobile trading industry in China.In the DT era，big data is a“new energy”promoting industrial development.The processing，analysis and application of the data of second-hand vehicles will bring tremendous energy to the development of the entire industry.As one of the used automobile trading e-commerce platforms，RenRenChe has set up Big Data Research Institute which is dedicated to technological innovation，transaction empowerment and decision support，realizing intelligent coverage of the entire industry chain and greatly improving the efficiency of used e-commerce platform circulation.Also through in-depth analysis of the big data，it is better to explore the development trend of used cars and promote the more scientific and sustainable development of the used car industry.