Abstract: In order to identify the water inrush mechanism in working face Laogongyingzi I03 (2), the water inrush source was analyzed from water quantity, water table changes and water quality, it is thought that the Quaternary aquifer water made water inflow greater that cause water inrush. From the height of water-flowing fractured zone, the thickness of weathering zone and the nature of effective water-resisting layer, the water inrush channel formation process was analyzed, and it is the composite channel composed by water-flowing fractured zone, seepage channel formed by roof water pressure and weathering zone. It is revealed that water inrush is a dynamic change process which occurs under the specific geological and mining conditions.