Abstract:According to the observation of shadow in Glory on aeroplane.It is concluded that the apparent size of any part of the shadow depends upon the distance of this part to observer’s eyes.Since short distance has large visual angle and long distance has small visual angle,and unnotability of the shadow in Glory depends upon the amount of scattering light given by the air particles containing in the space between the shadow and the observer’s eyes. So the whole appearance of the observer’s shadow in Glory will change with any changes of the distances between the parts of shadow and the observer’s eyes. In this paper, the author also gives three types of shadow in Glory in order to illustrate the rules using this shadow principles.It is said that only the shadow of observer but not his nearly companion is shown in Glory.The author explains this common sight in this paper,and mends its statement in order to give a more correct expression.