Abstract : 14.5 AP Ballistic impact on armor steel was simulated to investigate the effect of material and obliquity on ballistic resistance performance. The research was conducted with explicit dynamic code and AUTODYN on ANSYS commercial software. The result revealed that single layer of 10 mm V250 steel could not defeat 14.5 mm AP bullet. The second layer of alumina ceramic on V250 steel can increase ballistic resistance of V250 steel and leads troop survivability.