Abstract: The paper gives a brief introduction of the relationship between the energy structure and the environmental pollution, presents the idea to improve air quality from two aspects : energy efficiency and changing energy structure, where the latter will come out to be the focus. The bottom line of energy efficiency is to wash out the outdated production capability and pursue the Green GDP.Domestic and worldwide energy structures are described. At present in China, coal is main resource due to the lack of petroleum. The amount of discovered natural gas is also small. The energy structure is lagged behind compared to the international average level, which is inappropriate for the economic development of China. The amount of discovered shale gas in China is at the top ranks of the world. Considering the successful exploration and utilization of shale gas in US, China has established the Shale Gas Research Base, which is anticipated to be helpful for changing Chinese energy structure. In order to reduce pipeline construction costs, international researchers have utilized the TMPC technique (Thermo Mechanical Process Control) to optimally select the metallurgical structure of pipe material, thus high-grade steel pipe materials X100, X120 have been successfully developed. In China, researchers have even successfully developed the LSAW X100 and X120 pipe steels. The author predicts that China will be the pioneer constructing oil & gas pipeline with X100 or X120 pipes in the world.