Recent dynamic computations of zonal flow and analysis of oceanographic data of CSK in winter indicate year-to year variations in the location and dynmic structure of the Subtropic Countercurrent in the western North Pacific. In January 1966, the Subtropical Countercurrent migrated southward to 21$^{circ}$- 22$^{circ}$N Lat in association with the subsurface Subtropical Convergence. At the area of 25$^{circ}$- 26$^{circ}$N Lat, another surface thermal front was formed along which a stronger eastward flow of approximately 0.4kt is seen. On the section of 142$^{circ}$E Long in January 1967, eastward flow appears at every interval of 2$^{circ}$latitude in the northern waters of 20$^{circ}$N Lat.