This paper took Dongtan coal mine 3303fully-mechanized sublevel caving mining working face in FS46fault nearby track transportation tank as the research background.By combining numerical simulation and field observation method it discussed the 3303fully mechanized top-coal caving face, the rail in overlying coal seam mining stress distribution during the changing situation. And through the 3203mining face roadway deformation analysis, the paper analyzed and defined the stress concentration area and further the structure complicated regional mine pressure law appeared, revealed the influence law of the complex geological structure of coal seam mining, provided reference for the working face of the similar geological conditions in high yield, high efficiency, safety production.