Abstract: According to the air leakage law of the forced ventilation air duct in the blind seam driving gateway and the gas emission law of the seam gateway, the g as distribution law of the forced ventilation in seam driving gateway was analyzed theoretically.A calculation method of the max density of gas in the gateway and the di stance to the coal mining face was provided.The analysis showed that the gas density would be rapidly increased with the distance of the gateway driving distance incr eased and then would be slowly reduced.In combination with the certain parameters of No.2264 seam driving gateway in Tanjachong Mine, the ventilation distribution | aw of the gateway, the gas distribution law and the gas emission quantity with different distance to the seam gateway driving face were analyzed.In comparison with the site measured value of the gas density distribution in the gateway, about 260 m to No.2264 seam gateway driving face, the gas density was quantitatively calculated an d the max gas volume fraction was 0.78% .About 380 m to the seam gateway driving face, the gas emission value was basically stable and thus the correction of the law was verified.