The 7050 high-strength Al alloys are easily to be cracked and the repair layers are easily oxidized and have much lower strength than the substrate materials when they are repaired with the thermal processing additive manufacturing technologies. To solve such problem, the work takes 7050 high-strength Al alloy journal box body used in high-speed train as an example and adopt cold spray, a low temperature solid-state material deposition process, to construct the repair layer.