Abstract: In order to provide scientific basis for control and prevention of working face gas in highly productive and efficient mine, aiming at the reality of working face gas emission and production capacity, we analyzed measured data by linear, exponent, power, logarithmic and polynomial fitting, obtained the functional relationship between working face gas emission and production capacity (daily production). The results showed that the correlation coefficient R² of function got based on polynomial fitting was the maximum with value of 0.836 9, and corresponding trend line was the nearest to site practice. Through analyzing the curve fitted by polynomial way, outcome showed when the working face production capacity rose from 0 to 21 540 t/d, the gas emission rate gradually increased; when the production capacity increased from 21 540 t/d, the gas emission rate gradually decreased ; when production capacity of working face kept constant, corresponding gas emission rate could be predicted by the fitted function, which provides basis for working face ventilation parameters and the prevention of gas overrun in upper corner.