The Olkha plateau is a region in southeastern Cisbaikalia. It is located between Angara and Irkut rivers and is limited on the south by coast of the Lake Baikal. The check-list of vascular flora is created on the base of original and published data. Flora includes 1050 species and subspecies from 471 genera and 116 families. The list is supplemented by information about species ecology and frequency in the region. For some species the localities are added. As a conclusion, the short analysis of the flora is given.