The "GB/T 33431-2016 Guide to Film Thickness Design of Anchor Lips" standard provides terms, definitions, design principles and methods for anchor lip design. The standard focuses on the design and film thickness selection of ship boss-type anchor lips and provides a reference for Miscellaneous type anchor lips. The standard defines in detail the function and structure of the anchor lip, including its role at the outlet of the outer plate of the anchor chain barrel, how to withstand the collision and friction forces of the anchor and anchor chain, and ensure the stability of the anchor in the collection position.