Compared with GC-MS, the advantages of GC-MSMS are below: 1. With cascade function, strong qualitative ability and quantitative ability, MRM signal-to-noise ratio is higher than SIM of GC-MS; 2. In addition to general ion scanning functions, it also has functions such as SRM, MRM, precursor ion scanning, and neutral loss (not for ion traps); 3. It is very helpful for the structural research of characteristic groups; 4. The sample does not need to be derivatized; 5. Achieve confirmatory quantitation in a single analysis; 6. Low detection limit in complex and dirty matrix, improving laboratory efficiency and output rate.