Abstract: The dynamic seal is the seal between the relative moving parts in the machine(equipment).At present,the sealing methods of the dynamic seal structure are mainly metal seal and non-matallic seal.In non-matallic seals,rubber seals are mostly used.In this article,a high vacuum dynamic seal structure for aerospace is introduced.The structure of rubber as the main sealing material and its sealing performance testing device are used to test the sealing performance under different conditions before and after aging.The test data are compared and analyzed,and the changes and conclusions of sealing performance are obtained.