Gas chromatography refers to the use of gas as a mobile phase chromatography. Due to the fast speed of sample transfer in the gas phase, the sample components can reach an instant balance between the mobile phase and the stationary phase. In addition, there are many substances that can be used as stationary phase, so gas chromatography is a separation analysis method with fast analysis speed and high separation efficiency. In recent years, the highly sensitive selective detector has been used, which makes it have the advantages of high sensitivity and wide application range.