Based on the experimental hydrodynamic performance data of NPL 4b, the codes based on the STF (Salvesen Tuck Faltinsen) method and RANS method were developed and validated. Then the ship hulls with different bowshapes were investigated in head seas adopting the STF method and RANS method respectively. The former conditions are Fr=0.8，2≤ωe≤20 and the latter ones are Fr=0.8 and λ=1.5Lpp. The relationships between the wave profile along the hulls and the motions of the ships with the frictional resistance and the residual resistance were discussed respectively. Finally, conclusions on the advantages and disadvantages of the four different hulls were drawn, which showed that the origianl hull  had the lowest frictional resistance, the AXE one had the lowest wavemaking resistance while the wave piecing one performanced best in waves.