Abstract The substitution effect of a few percent of V and Nb for boron in the cobalt base amorphous alloys on the induced magnetic anisotropy has been investigated. Disk shape samples have been subjected to isothermal magnetic annealing in the temperature range 260-320℃. The kinetic curves of formation of induced anisotrpy have been measured with a sensitive torque-magnetometer and the kinetic parameters have been calculated by assuming that the distribution of re-lexation time obeys a log-normal law. These results show that subtitution of vanadium or neobi-um for boron in the cobalt amorphous alloys can reduce the Ku∞ (T) effectively but only have-a very slight effect on the kinetic parameters. The problems of the influences of transition metal additions on the induced magneto anisotropy and stability are discussed.