The density, structure, chemical element analysis,mechanical, physical and friction properties of a certain type of aircraft brake material 鄄a beryllium alloy were investigated. A comparison of some performances be tween C/ C composites, C/ SiC composites and the Be alloy made by powder metallurgy(PM) was made and the re sults show that beryllium alloy has low density, excellent mechanical and friction properties,and is a potential brake material