Introduction. The article studies plot formation patterns in The Song of How Bogdo Jangar Defeated Mangas Utu Tsagan and The Song of How Bogdo Jangar Defeated the Mangas Khan Kürül Erdeni included in the Baga Dorbet cycle of the Jangar (early narratives recorded in 1862). Materials. The work explores original Clear Script texts of the songs kept at the Manuscript Department of St. Petersburg University Library under the title ‘(Handwritten Records of) the Jangar (Made in B[aga] Dorbet District)’. Goals. The paper aims at examining the plot formation patterns in early songs of the Jangar through the use of descriptive and comparative research methods. Results. The analysis of plots shows the epic poems are interrelated and arranged in special sequence. The set of intertwined motifs serves to shape a plot based on some conflict (song one — an ultimatum of the enemy, song two — a horse raid) determining and determined by exposition, climax, and denouement. Plots of combats involving Bumba’s heroes are successive chains of separate episodes aimed at revealing the key idea of the epic — glorification of heroic exploits undertaken by Bogdo Jangar and his warriors for the sake of Motherland’s liberation from hostile invaders.