Abstract: In order to fully find out the mining goaf distribution conditions and the safety hidden dangers existed in the Yulin local mines, surface ground reconnaiss ance, physical exploration, drilling exploration and other means were applied to the comprehensive survey of the mining goaf. With the reconnaissance, a fully investiga tion was conducted on the important buildings, surface ground subsidence and ground cracks. Thus the locations, size and scope of the goaf in the mines were prelimin arily understood. A preliminary analysis was conducted on the danger of the goaf. The physical exploration means could be applied to detect the suspicious and key are a and the location, distribution scope and fire conditions of goaf could accurately obtained. The drilling exploration means could be applied to obtain the strata structure and the physical exploration results could be verified. Then based on the exploration of the goaf, the hidden dangers of the goaf were fully analyzed. And with the succe ssfully control experiences of Ordos Mining Area, the comprehensive control was conducted on the goaf of mines in Yulin City.