The system is a kind of methane and non-methane hydrocarbon analyzer independently developed by Wayeal, which realizes the direct measurement of ambient air non-methane total hydrocarbon. The instrument adopts the GC-FID method to measure the concentration of methane and non-methane hydrocarbons directly by back-flushing and enrichment of the sample gas, realizing accurate measurement of non-methane hydrocarbons (NMHC) at low concentrations.