Using Modulation Transfer Function(MTF) method to evaluate image quality and establish reasonable stabilization system performance standard, is a serious problem during the design process. Based on transfer function theory of linear optical system, dynamic image process during uniform, accelerated and sinusoidal motions were studied and numerically analyzed. The relationship between image motion and dynamic image quality was established. And a new method based on discrete phase intervals was especially developed to evaluate low frequency sinusoid motion. The analysis and results indicate that with the same image blur of 0.5 pixel, MTFs of high frequency sinusoid motion, linear motion and low frequency motion can respectively reach 0.85, 0.9 and 0.998, to obtain good dynamic images. The conclusion was made that high frequency vibration damages the image quality most, linear motion less and low frequency does the least. According to analysis given, dynamic MTF can be solved for a certain image motion, to offer quantitative reference for the image evaluation of aerial camera.