Abstract: This article analyzed the cost of mainstream hydrogen preparation technology first.Based on China's energy structure in the majority of coal，the characteristics of hydrogen preparation and different materials cost difference，pointed out that China should give preference to the preparation of coal to hydrogen.Besides，the energy density of the hydrogen fuel cell is greater than the lithium battery in electric cars.Hydrogen is an environmentally friendly energy that the reaction products from fuel cell is only water，also there is no pollution problem as lithium battery in life cycle end.The establishment of hydrogen society is a good opportunity to promote the transformation of China’s coal industry.