In order to study the dynamic characteristics of the friction pair fluid- film flow field for high parame-ter mechanical seal for improving the dynamic stability of the seal system，the three- dimensional FEM model of thefriction pair fluid- film flow field was established，and the pressure，speed，friction torque，carrying capacity andleakage were numerically，analyzed by CFD soft． The relation and the influencing rules between the speed andpressure of the mechanical seal and the pressure field，carrying capacity，friction torque and leakage of the frictionpair fluid- film flow field were respectively studied．