To optimize the opening ability of gas film of dry gas seal,the aerostatic dry gas seal with slit restrictor was designed by combining the slit restrictor with aerostatic dry gas seal.The influence of the structural parameters and arrangement of slit restrictors on dry gas sealing performance was investigated by Fluent software.The results show that the slit throttling aerostatic dry gas seal has a higher opening force than the classic orifice aerostatic dry gas seal on the premise of same throttling area.The influence of slit circumference-radial length ratio on the opening force is independent of equalizing groove circumference-radial length ratio,there is an optimal circumference ratio that maximizes the opening force of the gas film.Under the premise of a certain radial width,the more abundant the plane space of the equalizing groove,the wider the range of the gas film high-pressure zone within the sealing gap,and the better the pressure distribution effect.The opening force grows as the radial and circumferential column number of slit increases.Compared to circumferential continuous slit arrangement,the discontinuous slit arrangement results in higher opening force.