In this paper a new method has been advanced to make the rainbow colors glass. A susceptible photosensitive coating film was prepared on the ordinary fiat glass by chemical coating. Then the grid pattern of different density has been recorded on the photosedsitive coating by the duble-diffraction system in darkroom. After having been chemically treated, it returns to the transparent fiat glass. Under the shine of the sunlight or the light of a lamp, the glass appears bright-coloured and beautiful seven-colors, i. e. rainbow colors.