The structure of HV single core cable will change the transmission line parameters of high-voltage single-core cable. Common analytical models consider the sheath as a smooth layer. The influence of cable corrugated aluminum sheath on transmission line parameters is studied by using finite element method. The paper expounds the basic concept of cable transmission line parameters and the simulation calculation process by finite element method. The transmission line parameters are calculated and compared among smooth aluminum sheath, corrugated aluminum sheath without gravity influence and corrugated aluminum sheath structure with the influence of gravity. The calculation results show that the corrugated structure increases the characteristic impedance and attenuation, and reduces the propagation speed, while the corrugated structure along with gravity has a significant effect on the parameters.