As one of the active control technology function, high speed protection has been widely implemented in various modern commercial airplanes. Starting from Airbus real design example, the necessities and design targets of high speed protection function are analysed. And some detail design considerations are elaborated which including speed margins between VC and VD, control law design schemes and failure conditions. Finally, the relationship between high speed protection and the other envelop protection function including bank angle protection , pitch attitude protection and normal load factor are discussed.