Abstract: Aiming at the problem of complex geological conditions,frequent fault development,and insufficient resolution of the traditional exploration method in the third panel area of No.4 Coal Mine in Jianzhuang Coal Mine,based on the theory of high-density 3D seismic exploration,adopting an optimized observation system design,including the application of regular bunch shape observation system and dense deployment of shotpoints and receiving points,combined with high-precision data processing technologies of static correction,deconvolution,and 3D deviation imaging,the signal-to-noise ratio and analytical accuracy degree of seismic data are significantly improved.Through directional drilling and roadway excavation verification,a total of 20 faults are detected,including 2 faults with a large drop greater than or equal to 5 m and 18 faults with a medium small drop less than 5 m.Taking the NDF1 fault in the northern district as an example,the actual drop range is 8.4-18.7 m,and the plane position error is controlled between 2.3-35.6 m,the high accuracy and applicability of high-density 3D seismic technology are verified.The research results provide scientific basis for optimizing coal mine mining and excavation schemes,effectively reducing construction risks,improving production efficiency,and providing technical reference for complex shallow-buried coal seam fault detection.