New cast aluminium alloys developed in recent years are introduced systematically in this paper. ZL115A alloy in Al\|Si\|Mg system with high strength and marine corrosion resistance has been successfully used in advanced weapon case. ZL305A alloy in Al\|Mg\|Zn system with high strength
good marine corrosion resistance and age stability has made success in side scuttle
underwater weapon case and other casting parts subjected to marine corrosion. ZAlZn4Mg4 alloy in Al\|Mg\|Zn system with high strength and good dimentional stability has also been successfully used in platform and support of inertial navigator.\=