Quaternary inverse microemulsion of a cationic surfactant (cetyltrimethylammonium bromide, CTAB), octane, waterm and 1- butanol has been investigated by using conductivity, pulsed foeld fradient spinechol NMR measurements. The conductivity behavior of such microemulstions has a distinct percolative phenomenon. In the W/O microemulsion region, the self -diffusion coefficient of water is relatively high(2～7×10^-10m·s^-1) due to higher solubility of water in the continuous phase, which is composed of octane (ω= 10%) and 1-butanol (an apolar solvent and a weak polar solvent ), and "sticky" collisions between the droplets tn the percolation rane. Pentration of a large amount of octane molecules between surfactants chanis singnificantly lowers (1～3×10^-10m^2·s^-1) the self- diffusion coefficient of octane .

Key words: NORMAL OCTANE, WATER, MICROEMUSION, N-BUTANOL, NMR SPECTROMETRY, ELECTRIC CONDUCTANCE