A fastening assembly includes a magnesium alloy member, a metallic sheet defining a through hole, a metallic bolt, and a nut positioned on an end of the bolt and attached to the metallic sheet. The magnesium alloy member includes a magnesium alloy base, and at least one resin coating layer formed in at least one portion of the magnesium alloy base. The magnesium alloy member defines a through hole penetrating through the magnesium alloy base and the at least one resin coating layer. The metallic bolt extends through the through holes of the magnesium alloy base and the metallic sheet. An inner width of the through hole of the magnesium alloy member is greater than a width of the metallic bolt, a material of the metallic bolt is different from a material of the magnesium alloy base or a material of the metallic sheet.