Abstract The purpose of this research is to evaluate the tension variation of mooring rope on the floating breakwater made of abolish tires and the efficiency of wave elimination under the interaction of wave and water current. It has been shown that using the mooring rope system could reduce 56% instantaneous tension of the floating breakwater under the interaction. The mooring rope system on the floating breakwater had the maximum efficiency of wave elimination with low flow velocity (V) and high wave height (H). For instance, when V was 5 cm/sec and H was 15 cm, I found when the attack anger was 45¢X, 60¢X, or 90¢X, the efficiency of wave elimination was 73.7%, 72.10%, or 73.2% respectively. However, the efficiency of wave elimination was lower when V and H were high. For instance, when V was 15 cm/sec, H was 10 cm and the attack anger was 90¢X, the efficiency of wave elimination was only 40%. The efficiency of wave elimination was generally about 50% under other conditions. Therefore, the floating breakwater with mooring rope system apparently has high practical function and value.