The Fiber Optic Splice Closure is a connecting part of two or more optical cables and has protective parts. It is necessary to use in the construction of optical cable line, and it is one of the very important equipment. The quality of the optical cable joint box directly affects the quality of the optical cable line and the service life of the optical cable line. The Fiber Optic Splice Closure is a popular name, scientific name is optical cable connector box, also known as optical cable connector package, optical cable connector package and barrel. It belongs to a mechanical pressure sealing joint system, which is a splice protection device that provides optical, sealing and mechanical strength continuity between adjacent optical cables. It is mainly used for straight-through and branch connection of overhead, pipeline, and direct-buried laying methods of various structural optical cables.