This system is developed based on the design requirements of the "Guidelines for Continuous Automatic Type II Monitoring System for Greenhouse Gases (CO2, CH4, and N2O) in Environmental Air" issued by the China Environmental Monitoring Station. It consists of a gas analyzer, a cold trap, and a multi-channel gas control device. The gas analyzer uses QCLAS/TDLAS technology to achieve real-time and accurate online monitoring of greenhouse gases such as CO2, CH4, H2O, and N2O in the atmosphere.