With the development of launch vehicle heavy-duty，the weight of servo actuator increases due to the significant increase of its power level，and the traditional material and structural design methods have been difficult to further improve the power-to-weight ratio of the product.Carbon fiber composites have the advantages of low density， strong designability，high strength，high modulus，corrosion resistance，fatigue resistance，etc.，and have been widely used in aerospace field as large structural parts.Servo actuator as the key single machine of engine thrust vector control，its weight reduction is of great significance，domestic and foreign for carbon fiber composite actuator have carried out relevant research，but the domestic has not yet seen mature engineering applications.This paper focuses on the application characteristics of aerospace servo actuator，takes engineering application as the goal，and carries out relevant research in several aspects，such as structural design of carbon fiber composite actuator，pavement design and simulation，friction sub-surface enhancement and molding process method.The carbon fiber composite servo actuator prototype has been designed and manufactured，with a weight reduction of 49.2% compared with metal actuators of the same specification.The prototype has completed the relevant hydraulic tests，and its functional performance is comparable with that of the existing actuators，so it has a preliminary technical basis for engineering application.This research work has played a positive role in promoting the launch vehicle to enhance its capacity and reduce energy consumption.