Abstract: In order to ensure the safety of the 8306 isolated island working face under pressure mining in a certain mine of Shuo Coal Company, and to clarify the degree of influence of Ordovician limestone water on the mining of the 8306 working face.Comprehensive geophysical exploration was conducted on the structure and water abundance of the working face floor using transient electromagnetic method, audio electric perspective method, and radio wave perspective method. The water abundance and structural development of the working face floor were identified, and analyzing the safety of mining under pressure in 8306 working face based on geophysical exploration results. The results indicate that there is a limestone wall with almost no intrusion of water-bearing magmatic rock in the coal seam of 8306 working face, and several generally weak fissure water or low resistance rock masses are inferred within a range of 40m from the bottom plate. Among them, one fault is inferred in the southeast region to connect with the water-bearing body of Ordovician limestone water, and the Ordovician limestone aquifer below 40m from the bottom plate is inferred to have strong water-bearing ability - generally Ordovician limestone water;During the normal pressure mining process of 8306 working face, water inrush generally does not occur. However, if there is a hidden penetrating water conducting structure in the section, especially in the area where the water bearing body and structure overlap delineated by mine geophysical exploration, there may be a risk of water inrush from the coal seam floor.Water prevention and control work such as drilling and hydrological monitoring and warning should be done well.