The effect of friction to dry gas seal performance can’t be ignored under the condition of high parameter. Based on the structure characteristics of the sealing system and end⁃face, it was established the calculative model of lubricating gas film, used IC⁃EM to divide the grid. Then, conducted numerical simulation to get gas film pressure distribution and velocity distribution by using Fluent software. Finally, it calculated the friction coefficient of lubricating film by the law of Newton internal friction. The result of research shows that the friction coefficient of the lubricating film increases with the increase of the rotational speed, and it decreases with the increase of the medium pressure and the average film thickness in the groove parameters remain unchanged case. When the operating parameters are unchanged, the film friction coefficient increases with the increase of the root diameter, decreases with the increase of the number of grooves and the depth of the groove, and in 75° to 76° spiral angle range is relatively stable.