According to the cover rock caving features, the gob of fully mechanized cavingface was divided into 3 zones: natural collected zone, pressure effecting zone and pressstable zone. Based on these and the gob gas flow control equation, and considered the in-fluence to the mining fissured zone of gas drainage, also made use of CFD software, wefound an not uniform 3D numerical model of gob gas seepage and got the gas emissionlaw in gob of fully mechanized caving face (with or without discharge measures), and thiscan guide the engineering practice in some aspects.