Christmas tree, also known as Christmas tree, is the basic production system for extracting oil or natural gas under sea water.
　　Underwater Christmas tree originated from traditional oil exploitation engineering. With the continuous discovery of offshore oil resources, underwater Christmas tree technology has been applied to deep-sea oil exploitation.

　　Subsea Christmas tree can control the process of oil exploitation by connecting the equipment to the subsea wellhead. It can also manage the operation modes of gas production, oil production, water injection and gas injection, and can also carry out the maintenance of subsea oil mines.