Abstract: In order to ensure the continuous mining of the coal mining face under the mine air returning roadway, based on the crossing over mine roadway continu ous mining technology applied to No.5702 coal mining face in Jizhong Energy Xingtai Mine, a theoretical analysis method was applied to judge the key stratum formed with Yeqing limestone during the continuous mining of No.5702 coal mining face crossing over the air returning roadway.Based on the protection role of the key stratum above the coal mining face for the mine roadway, a practical study on the continuous mining of No.5702 coal mining face crossing over the upper No.210 air returning r oadway was conducted.The measuring results showed that during the continuous mining of No.5702 coal mining face passing over No.210 air returning roadway, there was only local failure occurred in No.210 air returning roadway, no serious deformation occurred in the roadway and a normal application of the roadway was ensured.