In the process of fully mechanized caving mining under water body,overlying rock of working face is easily affected by water body.When operation is improper,water inrush and sand leakage accident will happen. Therefore,the migration regularity of ore deposit overlying rock under the water must be mastered.The corresponding measures are taken to prevent the occurrence of disaster.Through the simulation experiment to different mining height of Hongtong Yuechang coal company 2-3 coal seam,approximately sums up the overburden caving zone height and diversion fissure zone height on different mining height,and then controls the mining height effectively,ensures the safety mining under water body.%在水体下综放开采过程中，工作面上覆岩层极易受到水体的影响，如果操作不当，就会发生透水漏沙事故。因此，必须掌握水体下矿床上覆岩层的运移规律，采取相应的措施防止灾害的发生。通过对洪洞悦昌煤业公司2-3煤层不同采高进行相似模拟实验，近似得出不同采高时的上覆岩层垮落带高度和导水裂隙带高度，进而通过有效控制采高，保证水体下煤炭开采的安全性。
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