The distributions of seabed soil and the tidal current characteristics in the Beihai-Lingao section submarine cable route area in the Qiongzhou Channel are acquired by analyzing the field survey and indoor test results,and the possibilities of soil mass failure in the cable route area due to 10 year and 50 year return period tidal currents are calculated and analyzed.

Based on the near-surface sediment distributions and physicomechanical characteristics in the Qiongzhou Strait Beihai to Lingao submarine cable route area and the earthquake data observed in the cable route neighbouring area,the possibilities of liquefaction or slide of seabed soil at depths less than 3 m in the route area under the earthquake actions are computed and analyzed.

The application of GIS to cable route design becomes our new choice,because the design of submarine cable route planning is complex,many-dimensional,dynamic and the traditional plane design is not visual and intuitionistic.

The research of submarine pipeline routing risk quantitative evaluation and relative;

The establishment of offshore oil platform will change the hydrodynamic conditions around the platform, among them, the scouring phenomena in the neighborhood of the platform foundation and its connected pipelines and cables will constitute a threat to the safety of platform and submarine pipeline and cable.