Abstract: In order to meet energy efficiency and economy of long-distance power transmission, submarine cables manufacturers need to use conductors with large-section specifications, among which special-shaped conductor has become a development trend due to their high manufacturing specification limit and stable structure.However, there are two technical difficulties in the production.On the one hand, stranding process is very complicated.On the other hand, there is no mature water blocking scheme for the conductor.In the paper, combined with actual production and debugging situation, relationship between stranding pitch, pre-torsion angle and other process parameters with stranding formation was explained, and scheme to enhance water blocking performance of specialshaped conductor was also proposed.