Double-chain quaternary ammonium biocides, cationic surfactants, as broad-spectrum non-oxidizing biocides, have strong water solubility, and some studies have pointed out that the disinfecting effect of double-chain quaternary ammonium biocides is not significantly different from that of chlorine-containing solutions and alcohols, and is better in terms of stability. It is stated in the Disinfection Measures for Sources of Pneumonia Infected by Novel Coronaviruses 2019 that: 1. diagnostic and therapeutic supplies are used exclusively, and the disinfectant containing 75% ethanol or disinfectant containing 20g/L double-chained quaternary ammonium salt is used to repeat the wipe disinfection for more than 2 times before use by the next patient. 2. In addition, for transportation vehicles, 2% quaternary ammonium salt can be used to wipe, for frequent contact with parts can be wiped 2 times. 3. Air-conditioning system air vents and filters final disinfection can be used 500mg / L chlorine disinfectant or 2% quaternary ammonium salt spray or wipe repeated 2 times, each time the role of 30min after wiping clean with water.