Abstract: Based on the wind data obtained from 25 meteorological observation stations along the coast of the Bohai Sea and Yellow Sea in winter and summer from 1975 to 2017, the spatiao-temporal modes and circulation variation on the interannual variation of seasonal mean wind-driven current velocity potential and stream function field in the Bohai Sea and Yellow Sea in winter and summer were studied with methods of the two dimensional nonlinear vertical mean winddriven current model and Rotated Empirical Orthogonal Function (REOF). Since interannual variation of wind stress field intensity significantly decreased linearly in winter and summer, the interannual variation linear decreasing rate of mean velocity potential and stream function intensity is greater in winter than that in summer. The interannual variation linear decreasing rate of mean velocity potential and stream function intensity in the Yellow Sea in winter and summer are greater than that of the Bohai Sea. The interannual variation of seasonal mean wind-driven current velocity potential and stream function field has two spatiao-temporal modes. The vertical circulation was significantly weakened linearly and the interannual variation of the quasi equilibrium state of the horizontal circulation is the major component in the Bohai Sea in winter. The interannual variation of the quasi equilibrium state of the vertical and horizontal circulations is the major component in the Yellows Sea in the same season. In summer, the vertical circulation in the Bohai Sea is significantly weakened linearly and the interannual variation of the quasi equilibrium state of the horizontal circulation is the major component in the Yellow Sea in summer when the vertical circulation in most of areas is significantly weakened and the interannual variation of the significant linear enhancement of the local vertical circulation is the major component. In winter the transmutation of the Yellow Sea Warm Current to the west and to the center Bohai Sea is finished by 3 to 4 circulations rather than a single circulation. In winter, the anticyclone circulation with divergent subsidence occurs in the center Bohai Sea and the eastern Yellow Sea, and the cyclonic circulation in the central Yellow Sea and the Bohai Strait are the control circulation for the intensity and range of the Yellow Sea Warm Current in winter. In summer, the anticyclonic circulation with divergent subsidence in the center Bohai Sea and the cyclonic circulation with convergence and the upwelling in the center Yellow Sea are the controlled circulation of the intensity and range of the cold water masses of the Bohai Sea and Yellow Sea. In winter and summer the interannual variation of controlled circulation state changes and it follows the warm/cold year interannual variations of the Yellow Sea Warm Current and cold water mass in the Bohai Sea and Yellow Sea.