The missile target deviation measurement is a key for fire calibration of antiaircraft gun weapon system. In order to improve the real-time property and measurement precision, the DSP was adopted to conduct high-speed digital image processing, and image processing techniques and the methods of the real-time acquisition of missile target deviation were studied. The image processing method was used to measure the missile target deviation, which avoids the visual measurement by the personnel fundamentally and has much higher precision, laying the foundation for improving fire calibration precision of the antiaircraft gun weapon system.