Bi 2 Mn 4 O 10 powder samples with controllable morphologies were prepared by a simple one-step hydrothermal route. By changing the species and concentration of mineralizer, various morphologies were obtained, such as shuttle-like, lump-like, sheet-like, and donut-like particles. The resulting products were characterized by X-ray powder diffraction, scanning electron microscope, magnetic and dielectric measurement. The morphology of Bi 2 Mn 4 O 10 powder is affected by various factors such as holding temperature, species and concentration of mineralizer. The lowest holding temperature for synthesis of pure phase of Bi 2 Mn 4 O 10 is 220°C. When the concentration of KOH increases from 2mol/L to 8mol/L, the particles evolve from shuttle-like to lump-like. Changing the mineralizer from KOH to NaOH, sheet-like particles were obtained. Magnetic measurements reveal that Bi 2 Mn 4 O 10 shows paramagnetic nature at room temperature and weak ferromagnetic property at low temperature.