The bow shape of KVLCC2 was modified to reduce the added resistance in waves and the final developed bow hull-form was named as KWP-bow(KRISO Wave Piercing Bow) reflecting its action in waves. The performance of KWP-bow and original bow was investigated through the regular wave test in KRISO towing tank. In the model test, the measurement system designed to allow surge motion was used to detect the small difference of added resistance due to the bow shape variation. The model test result showed that the added resistance in regular waves with KWP-bow was reduced by about 40% in the wavelength range of そ/Lpp=0.3 ~ 0.7 where the wave diffraction phenomenon is dominant. The motion response with KWP-bow did not change much compared to that of original bow. The effective horsepower with KWP-bow in calm water was increased only by 0.9%, whereas reduced by 7.7% in irregular waves of sea state 5.