Abstract: Xinli mining area of Sanshandao gold mine belongs to submarine deposit.The key point is without the inhomogeneous sedimentation, crack and subsidence in exploitation of the seabed.Under safety mining and to strengthen the mining condition of making the productivity up to 8 000 t/d, the suitable mining method should be selected.According to mining condition in Xinli mining area, the room and pillar filling method for large and thick ore-body is determined after research.

Key words: Under-sea mining, Room and pillar filling method, Option of mining method