Amorphous Ni-P catalysts were prepared by a chemical reduction method, and the promotional effects of Mo on the hydrogenation of nitrobenzene to aniline on Ni-P catalyst were investigated. However, the two crystallization temperatures of the 1% Ni-Mo-P catalyst were 644K and 723K, which were 15K and 43K higher, respectively, than those of the Ni-P catalyst itself; these results indicate that the presence of Mo increased the thermal stability of the Ni-P catalysts. SEM results showed that the particle size of the active component of Ni-P in the 1.0% Ni-Mo-P catalyst was smaller than that in the amorphous Ni-P catalyst. The N-2 adsorption isotherms for the amorphous Ni-Mo-P catalysts were the III-type, and the N-2 isothermal adsorption-desorption curves exhibited H-3-type hysteresis loops. H-2-TPR results showed that the addition of Mo had no effect on the reduction of NiO in the catalyst but negatively affected the reduction of Ni-P-O. H-2-TPD results showed that the hydrogen adsorption capacity of the amorphous Ni-P catalysts can be enhanced through the addition of Mo, and the optimal amount of Mo was determined to be 1.0%. The XPS results indicated the presence of a small amount of free metallic Mo in the amorphous Ni-Mo-P catalysts in addition to the Mo in MoO3. The use of 1% amorphous Ni-Mo-P catalyst at 383K and under 1.0MPa of hydrogen for 3.0h resulted in a nitrobenzene conversion rate and aniline selectivity of 64.5% and 98.8%, respectively.