Data from July 2-6, 1980 synchronous current observations (with plunging buoy arrays at 4 stations near the northern East China Sea Cold Eddy area ) and from large-scale hydrological observations by the Institute of Oceanology, Chinese Academy of Sciences, were used to analyze the temperature and salinity distribution characteristics, the structures of water masses and currents, and especially the turbulent mixing near the Cold Eddy in the study area. In light of Ertel’s tensor theory for turbulent exchange, the turbulent exchange coefficient and the turbulent mixing ellipse can be obtained according to the method for calculating the turbulent mixing ellipse. The results indicate that. 1.The turbulent mixings are anisotropic, being stronger in the directions of northwest-southeast, or north-south than northeast-southwest or east-west. 2.During the synchronous observation for three days and nights, the turbulent mixings had the weakening tendency day by day. 3.The rotary angles of the standard ellipse obtained by coordinates transformation rotate clockwise with time. In light of the variation characteristics of tidal current distribution in the East China Sea, the above mentioned horizontal turbulent mixings primarily reflect the property of tidal mixings.