Abstract: Analyse the significance of developing coal to olefin industry for China,as well as the importance of gasification technologies selection for the industry.Compare the economic benefits of different coal gasification technologies for olefin and natural gas production.Analyse the effect of different technologies on installation scale,technology routes,technology economy.The results show that,lump coal or crushed coal pressurized gasification technologies are better than entrained flow gasification ones.The coal gasification polygeneration for olefin production has broad application aspects.