To realize the commitment toward reducing CO2 emission made in the Paris Agreement, the automotive industry in China must lower its CO2 emission and contribute toward low carbonization. We have created a prediction model for CO2 emission from automobiles based on the architecture of low carbonization systems for automobiles, current emission situation within the automobile life cycle, and the sales prediction for 2030 in China. Using this model, the total CO2 emission of automobiles in China was predicted for 2030; we also analyzed the CO2 emission of the automobiles with respect to the total amount of CO2 emission in China. An evaluation system has also been set up for low CO2 emission from automobiles in China, and comprehensive suggestions for a low-carbon technology roadmap in China are also presented in this paper.