Taken the suction bucket foundation of an offshore fan in a sea area as the research object, the horizontal bearing capacity of the suction bucket foundation is studied by Abaqus finite element numerical simulation software when the soil around the foundation is lost due to the influence of water flow in different soil layers. The results show that the loss of soil in the bucket is of little effect on the horizontal bearing capacity of the suction bucket, and the horizontal bearing capacity of the suction bucket foundation decreases gradually with the expansion of surrounding soil loss, which affects the normal use of the offshore fan.