Dry gas seal is a new non-contact seal developed from the fundamental improvement of mechanical seals on the basis of gas dynamic pressure bearings in the late 1960s. In fact, the main fact is that by adding a Dynamic groove and the corresponding auxiliary system set up to achieve non-contact sealed end face operation. John Crane, the British company, took the lead in the late 70s to apply dry gas seals to gas platforms on offshore platforms and was successful. Dry gas seal was originally developed to solve the problem of high-speed centrifugal compressor shaft seal, due to seal non-contact operation, so the seal friction material basically free from PV value of the limit, especially suitable for high-speed high-pressure equipment shaft end seal.