In order to meet the need of the communication between aircrafts, a design of airborne servo mechanism is presented in this paper. Adopting DC servo drive, the servo mechanism can realize the pitch and azimuth movement of antenna array. The working principle, overall structure and composition of the servo mechanism are described in this paper, and it did detailed description separately for each component at the same time, the airborne servo mechanism can meet the requirement of light weight and small size. The static accuracy was improved by using the structure of doublegear eliminating backlash, and the stability control was achieved by using the inertial navigation system. High temperature work, low temperature work, vibration impact test and practical test indicated that the design of servo mechanism can reach the technical request, and can meet the requirement of airborne antenna as well.