Co/sub 67/Fe/sub 3.85/Ni/sub 1.45/B/sub 11.5/Si/sub 14.5/Mo/sub 1.7/ glass-coated amorphous microwires were prepared by Taylor-Ulitovski method under applied tensile stress and its effects on the giant magneto-impedance (GMI) were studied. The impedance was evaluated using an impedance analyzer at frequency of 10 MHz and network analyzer at frequency range between 10 MHz-3 GHz. It can be concluded that the changes of the GMI ratio /spl Delta/Z/Z(H) resulted in a shift of the magnetic field H/sub m/ for maximum /spl Delta/Z/Z and decrease of (/spl Delta/Z/Z)/sub m/ with tensile stress. The magnetostriction constant and its evolution with stress was also estimated from these measurements.