Abstract: Ultralaminaes were observed by Transmicssion Electron Microscopy analysis of ultrathin sections in a number of humic coals from late palaeozoic Taiyuan Formation and Shanxi Formation of Eastern part of North China, Jurassic coal measures of Turfan-Hami Basin respectively. Ultralaminae may occur as solitary, interval and aggregatein in humic coals, the two former are mainly in collinite matrix. The latter mainly in bituminite or lamalginite strands. Ultralaminae origins from selective preservation of the thin resis- tant outer walls of microalgae. Submicroseopically, Ultralaminae are important form of algae. Algae materi- al certainly far more widely spread through the humic coals than is visible as alginite.