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One-dimensional model dealing with the vertical distributions of 36 species inthe stratosphere was developed. The vertical distributions of 20 species observed inthe stratosphere are reasonably well reproduced by this model. The effects of theultraviolet variability associated with the 11-year solar cycle on the concentration ofthe stratospheric minor constituents are estimated.In the upper stratosphere O3, O(3P), O(1D), Ox, H, OH, HO2, Total H, CH3, CH3O2, CH3O, CHO, N2O5 and N2O show large variations of 4-8 % from the mean to themaximum solar activity. H2O2, CHO, N, HNO3 and HOCl show large variations of 4-8 % in the middle stratosphere. In the lower stratosphere O(1D) and CHO showrelatively large variations. The concentrations of CCl2F2, CCl3F, CH3Cl, CCl4, Total Cland Total N show no significant variations at any altitude.In the upper stratosphere N2O decreases at the maximum solar activity due tothe increase in the uv flux, while other species mentioned above increase. In themiddle stratosphere H2O2, CHO, N, HNO3 and HOCl show the decrease at themaximum solar activity. At the minimum solar activity the above variations arereversed with almost the same magnitude.