The total amount of ozone overheaded in late winter and early spring at Antarctica has decreased by about 30-40 per cent during past decade to form an "ozone hole". Some efferts to interpret the observed fact made by various authors were reviewed to give a comprehensive survey to the problem. The mechanisms raising both in view of photochemistry and in dynamics are as yet in their infancy, but they are the first step of the whole process of understanding the phenomenon. The author of the paper appreciate the idea that the perfect solution of the problem may come from the combination of the two views.