In application of the three-dimensional POM model, the tidal movement in the Bohai, Yellow and East China Seas were numerically simulated. The obtained tidal constituent constants were compared with the data observed from seventy-seven tidal stations, which gave the mean of absolute error; l.92 cm for the amplitude of constituent m₁ and 4.39° for its phase; 4.70cm for the amplitude of constituent M₂ and 5.08° for its phase. It was also shown that there were eight tidal current non-phase points for M₂, and nine for m₁, altogether. Among these tidal current non-phase points, one of M₂, which located at the Zhejiang outer sea a.r1d near the Zhoushan Island, and two of m₁, which located north to Yellow Sea and in the Taiwan strait respectively, were firstly found by this numerical work, with the rest acknowledged by other researchers. The distribution of turbulent eddy coefficient was also given and its relationship with the topography and the water depth was discussed, as well as. The rough result firstly obtained here show: l) the horizontal turbulent eddy coefficient does not vary notably in vertical direction but apparently in horizontal direction and the topography is another key factor influencing its distribution; 2) the ver1ical turbulent eddy coefficient is bigger and bigger from the surface toward the bottom or from the shallow place to the deep.