Abstract: The systematical studies of the Lower Tertiary strata of various inland basins in Henan are made in this paper. The Lower Tertiary System bears rich fossils, such as Ostrcoda, Sporo-pollen, Algae, Bivalves, Gastropoda, Charophyta Mammalia, etc., In algae fossil assemblages, the main compo-nents are Deflandrea, Bohaidina, Parabohaidina, Conicoidium, Leiospaevi-dia, Rugasphaera, Campenia and Pediastrum, etc., According to abundant algae fossils discovered in Lower Tertiary System in Miyang Depression, Xiangcheng Depression, Wuyang Depression, Tongben and Banqiao basins, it is believed that these regions would be in an environment of lacustrine facies with short inundation.