Magnetic rollers have been widely used in xerographic processes to transport the toners. Conventionally, magnetic rollers were made from extruded Ba‐ (or Sr‐) ferrite with energy product 1.4–1.8 MGOe. Recently, a magnetic roller with stronger field and smaller size is required by some laser printers or copiers. The MQ1 powder was used in designing a new bonded Nd–Fe–B magnetic roller with energy product about 3 MGOe. The distribution of the radial magnetic field of the quadrupole magnetic roller was measured by a Hall probe over the surface. The theoretical simulation was calculated by using the ANSYS Version 4.4 software. The error of the peak positions and the wave widths of the quadrupoles between the theoretical and experimental data is within 5°. The error of the peak value between theoretical analysis and experimental measurement is within 10%. The theoretical analysis of the magnetic roller is very useful for designing a new magnetic roller.