Abstract: Accounted for 71% of the earth's surface，the ocean is rich in mineral resources.With the dwindling of land mineral resources，subsea resources exploitation becomes the development direction in further.Subsea bedrock mineral mining is always in condition of rich water and high in-situ stress，so the distributions of water and stress and their fluid-mechanical coupling are significant factors of affecting the safety of subsea deep mining.Based on deep mining in the costal mine of Sanshandao Gold Mine，a series of surveys and measurements on water and stress were carried out to investigate the aquifers in deep mine，measure the in-situ stress，and analyze the joints' distribution law.Through the research on the rock masses' permeability，the fluid-mechanical coupling numerical model was built to simulate the deep mining process.From the research above the in situ stress distribution law，permeability of rock masses in deep mine，the space-time evolutions of displacement and stress during the mining process were achieved and the space-time distribution of potential hazards was also put forwards.

Key words: Subsea resources, Deep mining, Water, In-situ stress, Permeability, Fluid-mechanical coupling analysis