On the basis of own researches (1963–2016) and the literature analysis the current state of birds fauna on lake Baikal (from the middle of 20 on the beginning of 21 centuries) is considered. It is shown that the general list of bird fauna, in comparison with the end of 19 and first half  of 20 centuries has increased by 84 species (earlier 321, now 405 species). Taking into account that here have ceased to meet 10 before the registered species, the modern fauna of birds of lake is introduced by 395 species. Baikal is a part of territory on which climate warming in northern hemisphere of the Earth is expressed most strongly. Appearance here new species in summertime is bound to development of long dry-weather periods in the Central Asia (Mongolia and China). It is fixed three waves of moving of the birds bound to essential rearrangement of ecosystems, first of all Wetlands, these regions. However, changes in winter fauna of birds are caused by new climatic conditions of the lake Baikal. As a result of essential warming of the winter season the list of bird fauna has increased with 81 to 130 species, i.e. by 49 species. The causes and uniquenesses of climatic effect on bird fauna of this lake are discussed.