_{:Rare metals are commonly used in the manufacturing process of magnesium alloys, and the Pidgeon process is usually used for magnesium production, the production of magnesium is in vacuum, which resulting in discontinuous, it is necessary to study the condensation behavior of magnesium vapor in vacuum, which can provide theoretical support for continuous production. The condensation behavior of magnesium vapor at different volatilization temperatures and temperature gradients is studied. The results show that the increase of volatilization temperature, the initial condensation temperature decreases, the condensation region span of magnesium vapor increases, and the particle size of condensation products decreases. The volatilization temperature increased from 1000 ℃ to 1200 ℃, the initial condensation temperature of magnesium vapor decreased from 400.1 ℃ to 344.7 ℃, the span of magnesium condensation area increased from 11.5 cm to 16 cm, and the particle size of magnesium vapor condensation decreased from 68.33 μm to 24.60 μm. The temperature gradient increases, the span of condensation region becomes shorter, and has little effect on particle size. The research results can be used to guide the continuous production process of magnesium and the design of condenser for continuous magnesium production.}