Abstract: Single axis variable trajectory screen has complicated dynamic distribution properties, different exciting position always influence the movement trend and dynamic distribution of screen. Study on screen surface migration rule spectra of x direction amplitude, y direction amplitude as well as swaying amplitude though exciting position transformation, based on dynamical model of single axis variable trajectory screen. Results show that the screen box obtains excellent dynamic performance, when the exciting position is on the lower right side of screen surface. The migration rule of screen box flanks was opposite, when exciting position relative to centroid central symmetry. If exciting position on the upper side of screen surface, intersection of vibrating direction angle is on the top of screen surface, vice versa which is inferior. The amplitude of vibration of unilateral screen surface nearby the position of exciting is higher than the other side. Vibration amplitude of arbitrary points in the direction of x on screen surface depend on the position of exciting (L_ox, L_oy). The variation law of points that vibration amplitude spectra on x direction is opposite relative to centroid symmetry. The vibration amplitude in y direction is mainly affected by L_ox, more the distance to centroid, more the amplitude of vibration, and the extremal value exists.