The preliminary investigation means of submarine pipeline routing planning can be mainly carried out by side scan sonar and shallow stratigraphic profiler to survey the seabed geomorphology and shallow strata.In this paper，Klein4900 side scan sonar is used to survey the submarine geomorphology in the survey area of the submarine pipeline routing planning of Fuqing nuclear power plant.According to the survey results，the survey area mainly includes natural elements such as reef，sand waves，scour grooves and shoals.Artificial barriers include aquaculture area，fishing fence and underwater residual rope.According to the results of the survey，draw the map of the obstacle area，and can adjust the route planning to reduce or avoid the overlap with the obstacle area.The application of side scan sonar in submarine pipeline routing planning has a very wide space.