Characteristics of Halon fire extinguishing agents and their destroying mechanism to the atmospheric ozone layer were introduced.The research and development of various Halon replacements was reviewed and the properties of them such as HCFCs

HFCs

FICs

inactive gases

aerosol

fine water mist

new powder and foam extinguishing agents were emphatically discussed from several aspects such as efficiency

scope of application

environment effect and the development tendency.It showed that halohydrocarbons like HCFCs will phase out because of the potential threat to the environment

while fine water mist and aerosol will be better alternatives to Halons.The conclusion is drawn that the development tendency of Halon replacements is clean

hygienic to human being

harmless to atmosphere

high fire suppression effect and small investment.