Model tests are conducted to research the effect of cyclic loading frequency on bearing capacity of suction anchors with taut mooring systems under combined inclined static and cyclic loads at the optimal loading point. Following conclusions are obtained. The failure modes of suction anchor are vertical pullout if the direction of cyclic load is the same as that of the static load. The cyclic average displacement of the anchor is decreased with the cyclic loading frequency; but the influence of cyclic loading frequency on the cyclic average displacements become weak with the number of cycles. As the frequency varied from 0.1 Hz to 0.01 Hz

the cyclic bearing capacity decreases 8% and 4% respectively when the numbers of cycles to failure are 100 and 1 000; but the cyclic bearing capacity just drops 1% when the number of cycles to failure is up to 2 000 and then the effect of the frequency on bearing capacity can be neglected.