Abstract: The influence of annealing on the magnetic and mechanical properties of glass-coated Fe₆₉Co₁₀Si₈B₁₃ microwires is investigated. The results show that, after annealing at 450℃ for 20min, the axial and radial coercivities of microwire are 1.8Oe and 8.5Oe, decreased by 31% and 36% respectively, and the axial and radial remanence ratios are 0.031 and 0.012, decreased by 74% and 63% respectively, compared with the as-cast microwire. When the annealing temperature is lower than 450℃, the tensile strength of metal core is almost invariant, and the average tensile strength is about 2500MPa. When the annealing temperature is higher than 450℃, the core tensile strength decreases sharply. The fracture surfaces of the cores, being as-cast or annealed at lower than 450℃, all show some vein-like patterns, and the tensile strength increases with the amount of the vein-like patterns as well as their cross increasing, but the radial tearing band is the main features of the fracture surfaces of the cores after annealing at the temperature higher than 500℃, and the core becomes more brittle. When annealing at 450℃for 20min, the metal core exhibits lower coercivity and higher strength.