MnBi-Bi composites are fabricated by a magnetic-field-inducing technique under different fabrication fields (0, 0.3, 0.5, and 1T) and their microstructure and magnetic properties have been investigated. Microstructure results show MnBi crystals are aligned along the c axis in a Bi matrix under relatively moderate fabrication fields(0.5 and 1T). Magnetic measurement shows a pronounced anisotropy in magnetization in directions normal and parallel to the fabrication field, resulting from this alignment. Interestingly, the fabrication field not only improves the crystal quality of MnBi-Bi composite, but also increases the spin-reorientation temperature Ts of MnBi compound as well as the change in magnetization. On the other hand, an external field applied to the fabricated composite decreases the spin-reorientation temperature Ts. During the reversible transformation from the paramagnetic state to the ferromagnetic state, the magnetic transition temperature TC increases with the increase of external magnetic field for MnBi compound. Under a field of 10 T, a typical increase of TC is 20 K during heating and 22 K during cooling, respectively.