Abstract: In order to provide the scientificbasis for the gas prevention and control of the fully mechanized top coal caving mining face, according to the actual cond itions of the gas emission quantity and the production capacity of the coal mining faces in Chengzhuang Mine of Jincheng Blue Flame Coal Industry Co.Ltd., a ftting an alysis on the actual measured data was conducted.The analysis had obtained a function relationship between the gas emission quantity S (X) from the fully mechanized top coal caving mining faces and the production capacity X was obtained and had predicted the gas emission quantity of the fully mechanized top coal caving mining fac e during a production capacity period.The results showed that when the production capacity of the fully mechanized top coal caving mining face increased from 0 to abo ut 7 706 t/d, the gas emission quantity would be steadily increased. When the production capacity of the mining face steadily increased from 7 706 t/d, the gas emission quantity would be steadily decreased.When the production capacity of the coal mining face reached a certain level, the ftting function relationship could be applied to p redict the relevant gas emission quantity of the fully mechanized top coal caving mining face and could provide the basis to set up the ventilation parameters of the coal mining face and to prevent and control the gas content over limit at the top corner.