We investigate effects of the configuration and the bathymetry of the oceans on the tidal dissipation of the Earth's rotation. Discrete tidal equations with linear dissipation terms are solved for M
2 ocean tide using present oceans and a Permian ocean. Model properties are also examined through simulation studies by changing parameters related with the bottom friction and the eddy viscosity. These studies show that M
2 ocean tide explains for the most part the tidal dissipation of Earth's rotation and it seems that there is a tendency that the tidal dissipation was slightly smaller in the Permian era than in the present age.
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