In this paper, carbonyl iron powder and DISPER-Y220 are used as raw material and dispersant, respectively. The viscosity of slurry is detected as 0.55 Pa ? s and the slurry has good flowability slurry to be a printing ink. The ferromagnetic soft magnetic workpieces are prepared by direct inkjet printing process with the nozzle size of 0.5mm, 0.8mm and 1.0mm respectively, and then the samples printed have been through degreasing and sintering. The results showed that the viscosity of the slurry is lowest when the dosage of dispersant is1wt% and the viscosity of the slurry is increased with the solids content and shear rate increased .The slurry is shear thinning over the shear rate .The sintered body printed with the nozzle size of 0.8mm has a lowest surface roughness of 0.8μm. After sintered at 1300 ℃ for 2h ,the sintered body printed with the nozzle size of 0.5mm has a relative density of 96.3%, the saturation magnetization (B_S ) and the maximum magnetic permeability (μ_max ) reaching to 1.53T and 2630, respectively.