Abstract: Aiming at the problem that water inrush is prone to occur during the coal seam mining process of developed Wenwangshan Nanzheng strong water bearing and water conducting faults in the northern part of Zhangcun Coal Mine. Through the coal sample immersion softening test, the attenuation law of the mechanical characteristics of coal bodies near the fault zone is analyzed, and combined with the FLAC^3D numerical simulation results, a type of waterproof coal rock pillar width design method considering the fault drop and hydraulic conductivity is innovatively constructed; A hydraulic conductivity correction coefficient β is introduced to determine the width correction value of coal rock pillar according to the intensity of fault hydraulic conductivity; The "two sequence and one supplement" zoning segmented grouting process is proposed and adopted to conduct reinforcement on the fault fragmentation zones. The engineering application shows that after grouting, the recovery rate of rock cores in fault zones is improved from 48%-55% to 85%-89%, with a 35% of improvement in filling density compared to the traditional single sequence grouting process, the elastic modulus of strata is significantly increased, the displacement amount is controlled within the design range, and the stress distribution tends to be uniform, which provides a reliable technical support for the governance of fault fragmentation zones.