In the present paper the cause and dynamical structure of the coastal upwelling taking place off Zhejiang Province is discussed. The section distribution of water temperature measured in the area is a clear evidence of the existence of upwelling.To verify whether the upwelling here is mainly caused by the northward branch of the Kuroshio or by wind, the vertical velocities of the two are calculated separately,from data on both bottom currents and wind stresses collected in June-july of 1959 and 1963 respectively. The vertical velocity computed from current measurements near the bottom is one order larger than computed from wind stress. That means, in summer time, the major component of upwelling off Zhejiang Porvince is “nonwind-driven”. In order to show the numerical relationship between the intensity of the coastal upwelling in the area and of the northward branch of the Kuroshio, the correlation analysis is made between the temperature and the salinity on the basis of data of six summers. A new method to calculate vertieal velocity of water is suggested in the paper.