Laboratory gas circuit usually refers to the gas pipeline system used to drive experimental equipment in the laboratory. In the laboratory, gas cylinders or compressed air pumps are usually used to transport gas through pipelines to the equipment that needs to be used. There are many types of gases in the gas path, commonly including nitrogen, oxygen, hydrogen, carbon dioxide, etc. The design of gas pipelines needs to consider factors such as gas properties, pressure, flow rate, pipeline materials, and connection methods, and select appropriate gas transportation equipment and pipeline materials according to experimental requirements. In the laboratory, the use of gas circuits should comply with safety operating procedures to ensure the stability, safety, and reliability of the gas circuit system.