In order to study the effect of the ordered design of the bottom roughness on the microscale flow field of dry gas seal,the simulation and turbulence analysis were conducted through Fluent software.By approximating the rough element of the rectangular body to the deep change of the groove,and based on the direction of the fluid pump in order,the threedimensional geometric model was established,and the simulation verification was carried out by Fluent software.Choosing Tgroove dry gas seal (DGS) as the target groove type,the disturbed flow effects of roughness ordered design of Tgroove dry gas seal were studied.The results show that the directionregulation design of roughness order shape has significant influence on the performance of dry gas seal.The bottom of the groove with ordered micro modeling has good flow effect,which can effectively improve the sealing opening performance of Tgroove dry gas seal,and reduce the risk of the sealing accessory dry wear under certain conditions.Tgroove dry gas seal with the design of roughness order shape has better sealing performance at high pressure,high speed,small film thickness and deep groove depth than normal Tgroove dry gas seal.However,when the rotational speed exceeds a certain range,the disturbance effect of micromoulding structure will play a leading role and the opening force will be reduced rapidly.