The first record of wintering swans in Belarus was in 1961-1966 (Lesnaya river, Brest region). Mute Swans started to winter in the city of Brest in 1981. The numbers of wintering group varied from 60 (2003) to 224 (2011) birds in dependence of weather conditions during winter. We studied wintering group in Brest since 2003. In total 542 Mute Swans were ringed with metal rings during 2003-2016. To determine the degree of influence of Brest wintering group on the breeding population of Mute Swans in the region were used data of recoveries of rings. These data allowed to define the relationship of nesting and wintering birds. For study of breeding population of Mute Swans the permanent plot 25x25 km was selected in the vicinity of Brest. About 9-15 breeding pairs were recorded in this area annually. During 2005-2015 we found that 32 pairs from 41 (about 80%) had ringed birds wintering in Brest or observed in Brest after ringing. Another 10% (4 pairs) pairs were also ringed, but it was impossible to read the inscription. Furthermore, most of the birds have been read are 65% males. Approximately the same percentage of males observed wintering around 70% of all ringed birds. Main part of birds with rings reading during breeding period were also males (65%). Thus, the local group of breeding Mute Swans is highly dependent on wintering birds. Mute Swan males are more conservative than the females in the choice of wintering grounds and nesting sites, which causes a higher percentage of males among ringed birds in different seasons.