Limnological studies of the Uiam artifical lake located in the Chun chon city, in the chemical and physical point of view, chemical components and physical factors in this water, were made during a half year round from May to November in 1968. In the seasonal variation of water quality, amount of each component estimated in this lake was increased in a small measure in June in the Summer season, decreased a little in August after the rainy season, however, in October, slighthy increased again and in November gradually decreased according to the change of the atomosphoric temperature. Juding from seasonal and vertical variation of water quality, the Uiam lake can be seen one of the artifical reservios which shows a ordinary river`s nature. The order of rate of water pollution at three stations studied in the Uiam lake is as follows: St.2>St.l>St.3.