The effect of salinity, particularly high NaCl concentrations, on the phase diagram of the pseudoternary system cyclohexane/sodium dodecyl sulfate + propanol/water was studied at various temperatures. Drastic changes were observed with increasing salinity and a three-phase zone appears at approximately 1 M concentration. At still higher concentrations only two-phase regions remain. The volume measurement with increasing salinity reveals three types of Winsor formations (Winsor I, II, and III). The optimal salinity determined by plotting solubilization parameters of oil V(o)/V(m) and that of water V(w)/V(m) against NaCl concentration declines with temperature increment and attains a constancy above 70-degrees-C. Physicochemical properties, viz. conductance, viscosity, and adiabatic compressibility, investigated for a one-phase microemulsion in the presence of NaCl prove the existence of W/O, O/W, and bicontinuous structures in the system. An unexpected and surprising decrease in the conductivity of W/O samples with elevation in temperature was also noticed.