Abstract: Abstract: In view of the current evaluation of grouting effect in working face threatened by floor confined water and dynamic monitoring of the dynamic development of cracks in abnormal areas in working face during mining, the electrical intelligent monitoring technology is adopted to carry out grouting effect monitoring test in the low resistance abnormal area of 61304 working face in Tangshan Jiahui Coal Mine and real-time monitoring of coal seam floor in the process of mining. By monitoring the change of rock resistivity, the dynamic diffusion trend of grouting fluid and the dynamic development process of mining-induced fissure were successfully captured, and the dynamic development of water channel was timely warned. The research shows that the intelligent monitoring technology of electric method can clearly monitor the dynamic development process of the water channel and distinguish whether the water channel is connected to the aquifer. It is a new technology for monitoring the water inrush of floor in pressure mining working face, providing technical guidance for the mining of floor pressure working face and ensuring the safety of coal mine production.