The effect of n-pentanol on the rheological properties of CTAB/KBr micellar systems has been investigated. The addiion of n-pentanol induces the viscosity of CTAB/KBr micellar system to go through a marked maximum in 0.01 mol.dm^-^3CTAB/KBr solution. In 0.08 mol.dm^- ^3CTAB/KBr/0.08mol.dm^-^3 solution, a small amount of n-pentanol can make CTAB/KBr system have viscoelasticity, when the n-pentanol concentration increases continuously, the viscoelasticity of this micellar system decreases. Finally, we discuss these results in terms of the micellar aggregation number determined from time resolved fluorescence spectrophotometry.

Key words: PENTANOL, POTASSIUM BROMIDE, VISCOSITY, FLUOROSPECTROPHOTOMETRY, RHEOLOGICAL PROPERTY