[en] We investigate the entanglement property of a two-qubit, mixed-spin, Heisenberg system under a nonuniform magnetic field. We show that increasing b can improve the threshold temperature, and can also make the entanglement enhanced. It is very interesting to note that the joining of the nonuniform magnetic field b can not only induce the entanglement for the ferromagnetic case, but can also make the entanglement symmetrical in terms of J for a larger value of b, while the uniform field B cannot do this. We also analyze the ground-state entanglement features in detail