The possible usage of microemulsions for fire suppression is associated with a development and prospective employment of combined extinguishing agents which connect several mechanisms of burning termination, for example sharing water and chemically active inhibitors. But effective and chemically active inhibitors notably halohydrocarbons do not mix with water under ambient con¬ditions. Obtainment of the appropriate microemulsions may become the method of their con¬nec¬tion. In the present work the microemulsions water - sodium dodecyl sulfate - 1-pentanol - tri¬ethanol-amine - 2-iodoheptafluoropropane (IFP) and the water - sodium dodecyl sulfate - 1-pentanol - triethanol-amine - dibromotetrafluoroethane (BFE) of the “oil water” tipe at standard temperature were obtained and studied. It is known that at present BFE is used in fire extinguishing restrictedly due to high ozone-depleting potential. Therefore it would be reasonable to use and study new environmentally friendly halohydrocarbons. One of them is the IFP. The investigated microemulsions are characterized by approximately equal ratio surfactant + co-surfactant ( 21 wt. %) and different ratio between the amounts of oil and water. Determina-tion of the size of the microemulsions microdroplets and the study of their size distribution were performed by dynamic light scattering. It is shown that the structure of these microemulsions is characterized by the pre-sence of oil microdroplets in the aqueous dispersion medium. The size of the aggregates is situated in a fairly narrow range from 0.8 to 10 nm. With increasing of the halohydrocarbons content in microemulsion the position of the intensity maximum of the scattering light is shifting from 2 to 4.5 nm. The strongest increase in the size of the microdroplets is observed when the content of IFP above 4 wt. % and the content of BFE above 6 wt. %. The usage of obtained microemulsions as extinguishing agents may be appropriate by two reasons: first of all these are combined fire extinguishing agents in which the cooling effect of water is added to the inhibition of halohydrocarbons burning. Secondly, the microdroplets structure of microemulsions can enhance the extinguishing action of water by its breaking up at the evaporation of halohydrocarbons micro-droplets close to flame.