The second half of the last century and beginning of this century characterized by targeted climate change. It is reflected on hydrological regime and the factors of river flow formation. The regional features of the hydrological regime dynamics of the Baikal region on the background of climate change are considered in article. The long-term fluctuations of river run off are analyzed. The evaluation of long-term cyclic fluctuations of river runoff with use the integral difference curves is

more »

... ted. These curves reflect annual fluctuations of river run off and indicate to long-term exhaustion or accumulation of water in watersheds. Groups of the rivers with similar alternations of low water and high-water periods are allocated. Trends in runoff are analyzed. Trends of monthly average and annual river flow series for period till 1961 to present were considered. The increase in air temperature is mainly due to the winter months leads to intra annual redistribution of river flow. The majority of statistically significant trends of river run off are observed during the cold period of year.