The design of the labyrinth seal teeth on the rotor or stator has a great influence on the performance of the labyrinth seal.In order to reveal the influence mechanism of the rotor/stator teeth on the leakage and dynamic characteristics of the labyrinth seal,a multi-frequency elliptical vortex solution model for the leakage characteristics and dynamic characteristics of the labyrinth seal was established by using the unsteady dynamic grid technology.On the basis of verifying the accuracy of the solution model,the leakage characteristics and dynamic characteristics of the rotor/stator teeth labyrinth seal was analyzed,and the effects of the two structures on the stability of labyrinth seal rotor system were discussed.The results show that the leakage of the labyrinth seals of rotor/stator teeth increases with the increase of pressure ratio,and decreases with the increase of speed at the range from 12 000 r/min to 24 000 r/min.The leakage of the lrotor teeth labyrinth seal is always higher than that of the stator teeth labyrinth seal.The factor affecting the leakage of rotor/stator teeth labyrinth seal is the leakage area.Compared with the rotor teeth labyrinth seal,the stator teeth labyrinth seal has greater effective stiffness and effective damping.The tangential airflow force of the rotor/stator teeth labyrinth seal is opposite to the direction of the rotor whirl,both can suppress the whirl of the rotor.The tangential airflow force of the stator teeth labyrinth seal is greater than that of the rotor teeth labyrinth seal.Therefore,the stator teeth labyrinth seal is more conducive to the stability of the rotor system.