Magnesium alloy AZ91D is most suitable for die-casting. The performance of magnesium alloy is analyzed as follows: the products produced by magnesium alloy AZ91D are light in weight, and the tensile strength of die-casting can reach about 290Mpa. The thinnest die-casting can be 0.5 thick. The shell is used for weight reduction. The cast AZ91D magnesium alloy plate is generally used for prototypes and notebook casings. The rolled AZ91D magnesium alloy plate can reach 380Mpa.