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Abstract 12 coal belonged to confined aquifer mining beased on hole position analysis of borehole and field work experience of a mine. Safety of 12 coal mining was evaluated on the basis of water bursting coefficient method and safety pillars water resisting property method to reflect its mining feasibility, which showed that water bursting coefficient was 0.044 MPa / m less than its critical value; floor water resistance coefficient was 0.224 MPa / m and minimum thickness of working face floor was 36m greater than setting thickness of water prevention coal and rock column. As a result, it was clear that 12 coal mining over pressurized water was safe and feasible.
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