The paper presents a comprehensive assess-ment many years of population dynamics sable nature reserve "Yugansky" almost 30-year period (1988-2015), the degree of its recurrence, envi-ronmental factors identified that the influence the state of the population. Based on the data of winter route census conducted on the territory of the state nature reserve "Yugansky" in the period 1988-2015 the analysis of population dynamics of sable in dif-ferent habitats. Determine the optimal and pessimal habitat for this species, as well as their potential capacity for sable. It was shown that the most opti-mal habitats for sable are dark coniferous forests with a predominance of cedar, fir and spruce. The-se forests are characterized by high stern, protec-tive conditions and the abundance of places suita-ble for the formation of sable nests. In the period the number of depression, they also serve as habi-tats rub through, allowing survive to reproductive population the kernel. Low abundance of sables is characteristic of vast areas the watershed-raised bogs, complex of ecological conditions for the habi-tat of the sable in marsh habitats is poor, here also the highest number of the coefficient of variation (57 %). The level of population size sable constant-ly pulsing, reflecting the degree of change of the habitat. The statistical processing the time series indicates the number of sable cyclical component in its population dynamics. Analysis of the course sa-ble population dynamics leads to the conclusion about the stability of Yugansk population. This is typical for nature reserves sable groupings within the limits virtually the entire area of its habitat. The data obtained can be used to forecast the dynam-ics of populations of stocks of this species.