In use of solar energy, the most disadvantageous factor is its discontinuity. On overcast and rainy days or during the night, without sunshine, solar energy systems will stop working. To overcome this defect, the usual method is to use photoelectric and photothermic transformation to store solar energy. But because the efficiency of the photoelectric and photothermic systems is low and cost is high, the problem of storing solar energy becomes one of the most essential problems which must be solved. This article introduces ZnS thinfilm storing solar energy. This film can store solar energy and radiate visible light without photoelectric and photothermic middle transformation processes. This method is a new way to use solar energy.