To study the effects of rotational speed, inlet pressure, and the ratio of backlash to tooth width on the pressure drop and wind resistance temperature rise characteristics of inclined grate teeth seals, a two-dimensional stepped inclined grate seal model was established.Numerical simulation calculations were performed on the stepped inclined grate teeth seals to obtain the inlet and outlet pressure differences and wind resistance temperature rise under different speed, inlet pressure, and the ratio of backlash to tooth width, as well as the temperature and pressure of the jet at the last stage tooth gap.It is found that there is a high-temperature zone on the leeward side of the oblique grate tooth, which is caused by three factors,the friction effect of rotation,the step geometry and the mixing effect at the meeting point of two large-size vortices.The momentum exchange between the wall-attached large-size vortex and the main flow increases with the increase of rotational speed,while the momentum exchange between the main flow and the large-size vortex in the cavity weakens with the increase of rotational speed.The wind resistance temperature rise decreases with the increase of the ratio of backlash to tooth width, and increases with the increase of rotational speed, but the relationship with the inlet pressure is not obvious. The pressure difference between the inlet and outlet increases with the increase of rotational speed, and decreases with the increase of the ratio of backlash to tooth width. The pressure of the exit jet increases with the increase of the inlet pressure. The fitting formulas of pressure difference and wind resistance temperature rise coefficient were obtained respectively, and the fitting result was in line with expectations.