Abstract: The influences of alloy composition,geometrical characteristics and glass coating on the magnetic properties of the glass-coated amorphous Fe_79-xCo_xSi₈B₁₃ microwires are investigated. The results show that the glass-coated amorphous Fe_79-xCo_xSi₈B₁₃ microwires exhibit obvious magnetic anisotropy and the direction of easy magnetization is the axial direction. With cobalt content increasing,the saturation magnetization of the glass-coated amorphous Fe_79-xCo_xSi₈B₁₃ microwires increases firstly and then decreases. When the cobalt content is 10%,the saturation magnetization of the microwire achieves maximum value,being 1323emu·cm^-3. As the glass-coated amorphous Fe₆₉Co₁₀Si₈B₁₃ microwire,when the ratio k of metal core radius and glass coating thickness is less than 0.5,the axial hysteresis loop of the microwire is rectangular and appears large Barkhausen effect. With the kincreasing,the axial remanence ratio of the microwire decreases,but the radial remanence ratio keeps very small （about 0.03）. Both the axial and radial coercivities of the microwires decrease with kincreasing. After removing the glass coating,the axial and radial coercivities of the microwire with the initial glass coating thickness of 9.7μm and metal core radius of 10.9μm decrease 30% and 11%,respectively. Meanwhile,the axial and radial remanence ratios decrease 33% and 67%,respectively.