Abstract: In order to achieve image motion velocity accurate calculation, the method was put forward when using aerocraft attitude parameters in big attitude angle. According to the transition matrix that was from orbit coordinate to aerocraft coordinate, the relationship between coordinate system attitude angular in orbit and attitude angle, attitude angular velocity in vehicle coordinate system was derived in the big attitude angle. By calculation, when the scroll angle was 30, the maximum relative error of S1, S2 and S3 that were caused by scroll angle were 1.175%, 50% and 13.223%; when the pitch angle was 30, the maximum relative error of S1, S2 and S3 that were caused by pitch angle were 63.397%, 0.1745% and 63.397%.According to the high calculation precision of space camera image motion velocity, in a certain attitude angle, the method of using aerocraft attitude parameters was identified. This proposed method is simple and easy to implement, which is suitable for the research of image motion compensation of space camera.