Accuracy of airborne radar antenna servo control(ARASC) is one of important index for radar system precision search, identification and detection. Radar antenna was dropt and scan movement, because of wind speed and movement speed of carrier, making radar antenna recived more atmosphere resistance, atmosphere resistance was ceaseless change along with time and different angle of scan movement, it would be bring additive load distubance torque to ARASC. In order to controlling disturbance for accuracy of ARASC influence, improving ARASC movement preiciosn, ARASC disturbance observer(DOB) solving schene was put forward. ARASC dynamic model and servo control model were set up,additive load torque chose by atmosphere resistance was import to input end of controoled object for putting up compensate, according to improving accuracy in fact environment. Moeding simulation and expeerimentation analysis were put up with different wind speed influence,simulation experimentation show ARASC accuracy based on disturbance observer is better.