Abstract: Superior stealthiness makes submarines have strong penetration capability， so it is significant to control wake singatures for improving the stealthiness of submarines. Submarine wake singatures include the turbulence intensity, turbulent kinetic energy, and turbulence dissipation rate. Meanwhile， a satisfactory hull form can also restrain the wake singatures of submarines and can greatly improve its speed ability and stealthiness capability. In this paper， the viscous flow fields around SUBOFF and six improved submarine hull forms are calculated by using CFD technic RANS methods, based on which the effects of hull radius, bow hull length, and stern hull length on the submarine wake signatures are analyzed. The results show that in the wake of the original SUBOFF hull form and that of the modified hull forms, the increasing hull radius reduces the turbulence singatures far field astern, but augments the turbulence singatures close to the hull stern; meanwhile, the increasing bow hull length reduces the wake turbulence singatures close to the hull stern, but has little effect on the turbulence singatures far field astern; plus， the increasing stern hull length can alleviate the wake turbulence singatures significantly.