Principles of the choice: keeping to the natural disciplinarian, being practical and realistic in solving the existing problems; being considerable of both technology advancement and innovation and the adaptability, keeping to the real effects; being both beneficiary to the national energy safety and environmental protection, as well as the national economy and political stability; choice of the technologies needs to adopt “multi methods and paths”, as well as avoids scattering of the resources; phasing in, based the maturing degree and natural conditions, periodical technologies, in the R & D, test, demonstration, industrialization and commercialization.