Abstract: Orebody of Xinli mining area of Sanshandao Gold Mine is under the sea, strata movement and deformation which lead to penetration of sea water are not allowed in mining process.On the premise of overall planning of stope structure parameters and mining technology parameters of mining engineering, mining sequence, size and arrangement mode of pillar and thickness of roof and bottom pillar, through numerical analysis, seabed deformation laws under large-scale mining are obtained, while the reasonable mining methods and structure parameters are proposed.

Key words: Coastal gold deposit, Overall planning, Deformation law, Structure parameters