Solar photovoltaic power generation technology as a kind of new energy technology, its application in archives construction is still in the exploratory stage. The current problems and the development potential are still lack of systematically in-depth research, analysis and evaluation. Taking Beijing and Shanghai as examples,with consideration of national conditions of China and the characteristics of archives building,this paper studies the characteristics of the electric energy in the archives. On the basis of cost effectiveness and payback period,the paper analyzes the possibility and necessity in archives using photovoltaic power generation systems incorporated into urban power grid in the archives. Furthermore, a solar roof for power generation is proposed.