Abstract: On the basis of the new ruby laser apparatus, the experiment system of transient holographic interferometry is devised, by which vertical displacement fringe patterns at four different times are acquired in one blasting loading. And the vertical displacement changing of different sections is studied in linear blasting charge. The result shows that the displacements in axis direction are the smallest in any sections; it is found that the phenomenon of end effect which exists in stress field exists in the displacement field in linear charge too. Extreme values of vertical displacement at perpendicular line of the linear charge middle point is the biggest in all of the sections analyzed in the full field after any time of detonation; The strength of the displacement which is caused by Rayleigh wave reduces slowly.