Abstract: As a high-performance hull form，trimaran has attracted extensive attention from researchers. To investigate the effects that different slant side hulls exert on the wave-making resistance performance of trimaran，this paper presents a new trimaran model with slant side hulls，with which several resistance experiments have been conducted in a towing tank. By adopting the ship model towing test method，the experiments first measured the model resistance of the trimaran at different slant angles and with different loads. Then，the experimental data were calculated according to the Froude assumption and were correspondingly analyzed. The results show that selecting the appropriate slant angle of side hulls would reduce the sailing resistance of trimaran，which offers a good reference for the design of similar hull forms，especially for those emphasizing the speed performance of hulls.