Abstract: The key problem for the geodynamic model for the generation mechanisms of the ultrahigh-pressure metamorphic rocks is the explanation of the exhumation mechanism. In this paper the astronomical events are presented as a kind of geodynamic model to interpret the genesis of the ultrabigh-pressure metamorphic rocks.According to this “astronomical model”,the ultrahigh-pressure metamorphic rocks record three phases of formation,return and exhumation.These rocks tend to be generated under the high-temperature and high-pressure crustal conditions created by the impact of celestial bodies.The resultant new dynamic equlibrium allows for the return and migration of the remelted gneiss within the crust together with the ultrahigh-pressure metamorphic rocks upwards to the surface along the low-pressure fractured channels caused by the impact of celestial bodies.The ensuing subaerial erosion in the late stages is believed to be the main cause for the exhumation of the ultrahigh-pressure metamorphic rocks.