Abstract: By solving the current distribution equation of submarine cable's core wire, sheath and armor, the influence of grounding style, grounding resistance and armored material to the reflux characteristic of sheath and amour were analyzed in normal operation. The calculation results show that the reflux characteristic of sheath and amour is closely related to the ground state of submarine power cables. When the parallel distance is short and the parallel length is long, a submarine power cable on the magnetic induction effect of adjacent signal cable should not be ignored.