The concept of Christmas tree: Christmas tree is a device used to control production and provide conditions for workover operations such as steel wires, cables, and coiled tubing.

Integral: Various valves act as an integral component.

Split type: assembled from independent components such as valves.

Classified by production well type and completion mode: flowing well, electric submersible pump well, gas lift well, screw pump well and water injection well, Christmas tree of gas well, etc.