Abstract: The 8 main tidal constituents M2、S2、N2、K2、K1、O1、P1 and Q1 in the East China Sea, Yellow Sea and Bohai Sea were numerically simulated using the numerical ECOM model in the sphere coordinate system. The higher resolution grids were designed in the model, the calculated domain includes the East China Sea, Yellow Sea, Bohai Sea, the continental shelf slope of the East China Sea and the Northwest Pacific on east side of the Ryukyu Island, and the real coast and topography were considered. The model successfully simulated the tidal wave propagation features of the eight main tidal constituents in the East China Sea, Yellow Sea and Bohai Sea, reconstructed the 5 nodes and 2 semi-nodes of the semi-diurnal tidal constituents, and 3 nodes of diurnal tidal constituents in the calculated domain. Compared with the observed data at 65 gauging stations, the RAM of modal predicted amplitude and phase of the M2、S2、K1 and O1 tidal constituents are 7.85cm and 6.81°, 5.04cm and 8.14°, 3.82cm and 13.04°, 4.34cm and 9.33°, respectively. Compared with the observed data at 17 gauging stations, the RAM of modal predicted amplitude and phase of the N2、K2、P1 and Q1 are 3.64cm and 7.89°, 8.47cm and 10.51°, 1.76cm and 7.56°, 1.50cm and 26.34°, respectively. The model calculated results can be used for the tidal harmonic constants at open boundary condition of estuarine and coastal model with smaller calculated domain.