The POM model with the high resolution is used to reproduce the principal tidal constituents of M₂,S₂, K₁, O₁ in the Bohai Sea(117.5°E-122.5°E,37°N-41°N). The model results are compared with observations at 19 tide gauge stations and show the reasonable consistency. Bohai Sea is mainly dominated by the semi-diurnal tides, and M₂ constituent plays the leading role. The maximum possible tidal range is great along Bohai Sea coast and at the top of gulves, while small in the center area of Bohai Sea. Bohai Sea has the feature of semi-diurnal flow and M₂ constituent tidal flow is the strongest with a max flow velocity of 96cm/s. The results show that the tide current is rotary in the center area of Bohai Sea and rectilinear current in three bays. What's more, the maximum possible speed range of the tidal flow is especially strong in the Lao Tieshan channel, the Long Island and the area near Yellow River Estuary.