Introduction: carbon dioxide fire extinguisher is mainly used in the fire fighting equipment, archives, instrument and meter, 600 volt electrical equipment and oil. When in use, should first of all fire extinguishers referred to the fire place, lay down fire extinguishers, pull out the safety pin, the handle of a hand holding a megaphone roots. On the other hand grip opening and closing the valve pressure to. No spray hose carbon dioxide extinguishers should be put up, megaphone pull 70 - 90 degrees. When in use, can not directly use the hand to hold the outer surface of the cylinder or the metal connecting pipe, to prevent hand frostbite. When using carbon dioxide extinguisher, in outdoor use, should the windward direction injection; used in indoor space is narrow and small, after the fire operator should leave quickly, to prevent suffocation.