The main detecting method for gob and its filling by GPR was expounded.The space distribution of gob was obtained.The filling can be well identified by analyzing the radar images.

• 论述了采空区探地雷达探测原理与方法，并通过在甘肃厂坝铅锌矿进行现场试验，分析、识别了采空区内充填物类型及状态。