Abstract: Analytical method is usually applied to prediction mine water inflow，but its result often deviate far away from the truth，especially in mines with complex hydro-geological condition.It was discussed that applying numerical simulation Visual Modflow to solve the problem.By analyzing hydrogeology condition of Chaokewula Colliery，selecting simulation range and setting up model which was accordance with reality.On the basis of giving boundary condition，zoning，setting initial condition and time，water inflow of 1^st mining zone and whole mine were predicted.Numerical simulation result provided theoretical reference for mining under water body in Chaokewula Colliery.