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By analysis of the incidences of animal diseases of Beijing Zoo, the annual variation of incidences of various animal diseases and their inter annual variation trends are revealed. The correlation analysis between seasonal incidences of animal diseases and meteorological conditions shows that incidences of beasts diseases in winter and incidences of bird diseases in autumn have better correlation with the corresponding meteorological data. As a whole, the correlation between incidences of animal diseases in spring and summer with meteorological conditions is not apparent.