In order to realize high-quality imaging of the Mars surface by the Tianwen-1 high-resolution camera in large elliptical orbit， a large elliptical orbit image motion calculation model based on Mars is established. The calculation method of the large elliptical orbit and image motion is studied. First， according to the characteristics of the large elliptical orbit， the difference between the large elliptical orbit and a near circular orbit is analyzed. Then， the distance from the high-resolution camera to the center of Mars， the orbital velocity of elliptical motion， and the angle between orbital velocity and centrifugal velocity are calculated according to the characteristics of the ellipse and the conservation principle of angular momentum. Then， according to the method of homogeneous coordinate transformation， the Mars scenic spot coordinate system is connected with the high-resolution camera coordinate system， and the image motion velocity is obtained by deriving the position relationship. Finally， the correctness of the image motion compensation calculation method and its influence on image quality are verified through a dynamic imaging experiment. The experimental results show that： the calculation method of image motion compensation for large elliptical orbit is correct； the dynamic transfer function is greater than 0.1， and the dynamic transfer function is not less than 0.1； and the minimum value of image motion matching MTF （Modulation transfer function） is 0.953， which meets the requirement of no less than 0.95.