Abstract: Aiming at the characteristics that goaf damage area occurs spatial distribution in coal floor with hidden faults during mining-induced water bursting process. On the basis of considering the fluid solid coupling effect of mining rock, combined with specific engineering geological conditions of a mine working face, RFPA^2D-flow program is used to simulate mining-induced water bursting process of mining floor with hidden faults, the floor failure area is classified and analyzed. The results show that the floor is more likely to connect aquifer due to fault activation under the condition of hidden faults; compared with the complete floor, only when the working face advances to the first micro fault, the floor shows the similar water phase characteristics, after that according to the distribution characteristics of the hidden fault, the floor shows a similar cycle characteristic between the water inrush growth area and smooth traffic area.