Abstract: In order to realize a safety mining of No. 11011 coal mining face under the conditions of the high pressure water inrush, the high pressure floor was reinfo rced and the fault was controlled with pre-grouting.The similar simulation experiment was applied to study the floor water inrush and the reinforcement effect.With the a pplications of the experience formula, mechanics theory, neural network and the ANN, PLC and others methods based on support vector machine, the predicted failure depth of the floor was 20.12~23.63 m.With the application of the DC electric method, the failure depth of the floor was 23.48 m.The results showed that after the floor re inforced, the watery zone was obviously reduced, some area of the water zone was eliminated, the water quantity in the fault was obviously reduced, there was no wate r inrush danger occurred and the safety mining of the coal mining face was realized.