Abstract: Al coatings on depleted uranium surface were prepared with magnetron sputtering ion plating process at different pulse bias voltages. Surface and interfacial morphology of Al coatings were observed with scanning electron microscope. The distribution of element near interface between Al coating and uranium substrate was analyzed with Auger electron spectroscopy. The adhesive strength of Al coatings on uranium surface was measured with tensile method. Al coating prepared with pulse bias voltage at -900 V has better adhesive property to uranium substrate, and pseudo diffusion zone is relatively obvious at the interface between them. Compared with DC bias voltage, the coatings prepared with pulse bias voltage have enhanced adhesive strength and improved density.