The electrodeposition laws of Ni-Mo alloy in alkaline citrate solution were studied with potentiostatic deposition and cyclic voltammetry. Potentiostatic deposition indicated that the presence of MoO42- could reduce the deposition overpotential of Ni, and the deposition current efficiency of Ni-Mo alloy was lower than Ni in Ni deposition bath as the potential moved negatively. Cyclic voltammetry indicated that, as the content of Ni2+ increased, both the first reduction peak for Ni deposition and the deposition peak of Ni-Mo alloy moved to more positive potentials, and as the content of MoO42- increased, the deposition peak of Ni-Mo alloy moved to more negative potentials.