To investigate the rearing environment of aquatic vascular plants and the change of its spontaneity, field work was carried out in 6 rivers and their drainage basins located in Cholla-nam-buk-do area. The flora was composed of 56 families, 145 genera, 190 species,l subspecies, 27 varieties and 1 forms or 219 taxa; 57 species of hydrophytes, 74 of hygrophytes and 123 of waterside plants. Among hydrophytes emerged plant (E, 52. 6%), floating-leaved plant (FL, 21.7%), submerged plant (S, 19.3%) and freefloating planktonic plant (FP, 7%) were occupied, respectively. Dominant species was Hydrilla verticillata, but differed according to investigated. A significant place observed was Tamjin river and species to be protected were Hydrocharis dubia, Nymphoides peltata and Braenia schreberi.