In order to study the floating performance of the air film floating ring,the finite element model of floating ring was established and a calculation method of the floating speed was proposed.The finite element model of the seal assembly was established by using Ansys,the radial deformation of the floating ring and the runway was extracted to obtain the dynamic gap of the floating ring seal.The eccentric air film model of the floating ring seal was established by using Fluent,and the calculation process of the floating ring floating speed and leakage rate was proposed.The influence of structural parameters and operating parameters on floating ring floating was analyzed under two operating conditions,first increasing pressure to working pressure and then increasing speed,and first increasing speed to working speed and then increasing pressure,and a test bench was set up for testing verification.The results show that the leakage rate of the air membrane floating ring and the eccentricity under a low pressure difference have an approximately quadratic relationship,and the upward buoyancy is increased with the increase of the eccentricity but there is a distortion process.Under the premise of ensuring the sealing performance,a smaller wave spring elastic force and a larger throttling length should be selected when engineering design.The effects of various sealing parameters on the floating performance of the air film floating ring under different operating modes are very different.In general,the floating performance is better when operating under the condition of first increasing speed to working speed and then increasing pressure.When conditions permit,the floating performance should be analyzed before driving,and then the order to appaly the operating conditions should be selected