GYSS-001 series portable pretreatment systems are cold-drying pretreatment systems independently developed by our company for environmental monitoring and industrial field exhaust gas analysis. For the system, anti-corrosion and non-adsorbing materials are employed in the interior, the sampling probe and pipeline are kept in a high temperature in the whole course, and the condensing part of the sampling box has a low component loss rate. The system can perform a reliable pretreatment on flue gas, and provide analytical instruments with dry and dust-free sample gas with a stable flow and intact components, and thereby ensure accuracy and validation of measurement data.