In order to see the stratification related to the heat flux in Deukryang Bay, the oceanographic data on July 12, 1994 and the meteorological data of Kohung and Kwangju meteorological stations were analyzed. The temperature differences between the sea surface and the near bottom were 1∼3℃ on spring tide (July 12, 1994) in Deukryang Bay. The air temperature anomalies were high about 3℃ during summer in 1994. These mean that the tidal mixing was not effective in destroying the stratification due to the sea surface heating by the solar radition, even though it was on spring tide. The maximum solar radiation was about 600 ly/day, which was the value of the same date of oceanographic observation. The sensible and the latent heat flux which are 0∼100 ly/day were not so varied during summer. The absorbed heat flux through the sea surface was mostly lost by the back radiation, which ranges are about 0∼-400 ly/day. The dimensionless mixing parameter related to the buoyancy flux was 5∼-150×l0 ㄷ테 (-5). The efficiency of tidal mixing to destroy the stratification was 0.4∼0.6%.