Abstract：Ground directional overrun area management grouting reinforcement has become an effective means to liberate the graystone aquifer in the upper section of Taiyuan Group in the management process of the bottom plate bearing pressure water damage in North China Coalfield, how to objectively analyze and evaluate the construction data in the process of grouting, reduce the workload of construction verification downhole and at the same time ensure that the work face is safe and efficient back to the mine has become an urgent problem to be solved at present. According to the comprehensive analysis of the geological condition and construction elements of 21106 working face, multi-layer tuff bearing pressure water on the L10 tuff aquifer was selected to carry out the management mode of locking the edges first and then grouting, and based on the actual construction data in the grouting site, a comparative analysis was carried out on the grouting pattern, leakage pattern, and water outflow pattern of the grouting transformation drill holes. Engineering practice shows that: the structure, drilling construction sequence, construction time interval is the main factors affecting the ground drilling grouting volume; the location of slurry leakage is related to the grouting pressure, and the structure, grouting pressure and construction sequence are the main factors affecting the size of the leakage volume; downhole inspection is carried out after the end of the ground grouting, and the gushing volume of the test borehole outflow point is less than 10m3/h, and the final borehole water pressure is lowered from 2.23Mpa to 1.5Mpa, the distribution of water pressure is in the form of an island, and there is no abnormal area in the physical exploration test, which indicates that the effect of bottom plate grouting transformation is safe and reliable. The research results are successfully applied to realize the safe mining of working face on multi-layer tuff bearing pressure water under complex geological structure, and provide guidance and support for the overrun management of water damage on the bottom plate of the same type of mine.