This standard specifies the basic requirements for the structural design of the rotary shaft lip seal, including the design requirements for the assembly support part, main lip, auxiliary lip, skeleton, spring, etc. of the rotary shaft lip seal whose basic dimensions conform to GB/T 13871.1 and size series. In addition, this standard also gives the main parameters of conventional design and special design parameters (such as lip return form design, etc.). This standard applies to the rotating shaft end installed in the equipment, the rotating shaft lip seal ring that seals liquid or grease, and the pressure in the sealing chamber is not greater than 0.05MPa.