Abstract: The era of low-carbon economy,the factors that affect the energy companies investment are more complex,how to sort out the importance of each factors is particularly important for energy companies to grasp the direction of investment.On the basis of the energy companies,the analysis of the basic requirements of a low carbon economy on energy companies to invest,the use of analytic hierarchy process on the main factors the importance of judgment,concluded that low-carbon technologies,low carbon talent and low-carbon policies of major energy companies to invest impact.