CFD is adopted to do numerical computation for the condition of the ventilation in digging and blasting tunnel,and by using the characteristics of the press-in ventilation field in the tunnel,the distributing of gas consistency is analyzed.Results show that,in the influence of the ventilation field,the gas will gather on the coal wall of recirculation zone,and diffuse into the tunnel rapidly.It will provide a new theory basis for appraising the working face condition and ventilation efficiency correctly,and preventing the gas occurrence after out.