the aim of this study was to determine the effect of period plunged into languid nitrogen after freezing on the quality of frozen bull sperm. Semen from 11 bulls was collected by artificial vagina (AV) technique. Semen was evaluated pass for diluted with Egg-yolk Tris extender for freezing then divided into 4 groups by plunged semen at 0 , 24 , 48 and 72 hours,respectively. Results showed no effect of Velocity sprem, Progressive motility and Membrane integrity (HOT test) persen in semen significantly (P>0.05) . This study showed the period plunged into liuquid nitrogen after freezing that no effact on the quality of bulls sperm. If adaptable in the production of frozen semen that be reduce the period plunged after freezing the frezen semen that more request could distribute quickly into the area.