Abstract: Abstract：There are two main mining coal seams in part of Shennan shallow coal area, for the situation of 4-2 and 5-2 large height coal seam. It is found the caving feature and roof structure with re-mining during the physical simulation experiments, as a result, it shows that the main control stratum are key layer of direct roof, the lower effective key stratum (group) and the upper disturbanced key stratum. Furthermore, through combine the compared strata pressure result of single coal seam and coal seam group mining, summarized the feature of smaller weighting interval and larger compressive strength coal seam, it has important guiding significance to the safe and efficient mining of shallow buried coal seam.