The Portable Gas Chromatography - Mass Spectrometer GC-MS 2000 features a variety of flexible sampling systems such as thermal desorber, sample loop，headspace and solid-phase micro-extraction (SPME) etc, and can achieve the rapid qualitative and quantitative results of volatile organic compounds (VOCs) and semi-volatile organic compounds (SVOCs) in the atmosphere, water and soil on site. The instrument has the advantages of small volume, light weight, simple operation and "guided" graphical interface, and can be placed on the monitoring vehicle or shouldered on the back for using, making it a great analytical tool for environmental monitoring, food safety, public safety and criminal investigation science, etc.