The analysis of long-term changes of an abundance of wintering birds (1984/1985–2006/2007) is made. The maximum abundance of wintering birds is in mountain-forest site. It decreases towards the coast of Baikal. Population density for 23 years of observations fluctuated from 92 to 490 ind./km2. Maxima are noted in 2–3 years. The positive trend of long-term changes of an abundance on a key site is registered at 3 species. The same trend on separate sites at 3 species is registered. The negative trend is not revealed. Meteorological indicators of the winter period do not render essential influence on population density of the majority of wintering species of birds.