Abstract: Carbon dioxide emission is tremendous in coal chemistry industry，so CO2 emission reduction from coal conversion should be paid attention to. In this paper，possible large-scale CO2 emission reduction methods and measures were presented after analyzing and researching coal gasification technology，chemical process optimization and integration. CO2 chemical utilization with respect to industrial application and scientific research were also summarized and analyzed. It was found that conversion of dimethyl carbonate to high added value chemicals，and the reaction of CO2-CH4 to high added value chemicals are significant processes in CO2 emission reduction for coal chemical industry.