China has the largest coal production and consumption in the world. A large amount of CO2 is discharged due to the development and utilization of coal. In order to help realize the clean transformation and utilization of coal,the CO2 emissions of coal-fired power generation and coal gasification to methanol process was analyzed. The CO2 emissions from coal-fired power generation process and coal to methanol production process with coal gasification as the core were calculated. Through the analysis and calculation,in the coal gasification to methanol process,about 37% of carbon from the raw coal enters the product,which can achieve a certain proportion of "chemical carbon fixation". The CO2 concentration in the syngas produced in the coal gasification process is high. Coal gasification to methanol process is easier to achieve large-scale and low-cost carbon capture and storage than coal-fired power generation. Based on the co-gasification of carbon containing waste and coal,the concept of carbon cycle is put forward. It is a very potential carbon emission reduction technology to use gasifiers to deal with all kinds of carbon containing waste in a coordinated manner,so as to realize cross system carbon recycling and save the use of raw coal. Take 1 million t/a coal direct liquefaction project for example,the reduction of CO2 emission is about1.23 million tons every year by the gasification of carbonaceous wastes. CO2 emission reduction consists of three parts. Part I is about 0.58 million tons,due to about 50% of carbon from the coal liquefaction residues are entered the asphalt product. Part II is about 0.30 million tons,due to 10% raw coal for hydrogen production is placed by coal direct liquefaction residues raffinate. Part III is about 0.35 million tons by avoiding the direct combustion of coal direct liquefaction residues raffinate. If this method extends to the coal chemical industry,it can save about 23.91 million tons of raw coal in China and reduce 37.10 million tons CO2 emission potentially in 2019.