The microstructure, mechanical property and corrosion behavior of gravity casting and centrifugal casting Mg–9Li–3Al–1Ca alloy were investigated. The results indicate that the Mg–9Li–3Al–1Ca alloy is mainly composed of α-Mg phases, β-Liphases and Al2Caphases. After centrifugal casting, the blocky and elongated α-Mg phases of the gravity casting alloy canbe refined and spheroidized. Meanwhile, the amount of α-Mg and AlLi phases increases, however, the number of Al2Caphases decreases. Besides, a strong texture of β-Li phase on the (200) plane can be formed. The microstructure refinementand the decrease of Al2Caphases lead to the improvement of comprehensive property. The property of centrifugal alloyshas gradient along radius direction because the strength of centrifugal force varies with the centrifugal radius. The centrifugalcasting Mg–9Li–3Al–1Ca alloy at outside exhibits excellent comprehensive properties. The ultimate tensile strengthand elongation of centrifugal casting alloy achieve the value of 198.3 MPa and 6.0%, corresponding to 83.6% and 300.0%increments compared with gravity casting ones, respectively. The corrosion current also decreases to 89.4 μA/cm2, whichattributes to the weakening of galvanic corrosion attributing to the decrease of number of Al2Caphases and the transformationof corrosion pattern caused by grain refinement.