A brief introduction on underwater precision guided technical characteristic of torpedo and its primary countermeasure technical structure are introduced. The current conditions of the difficult submarine underwater countermeasure technology are analyzed. The mobile decoy technology, having synthetic target simulation and intelligent countermeasure capability, forms its technology structure featuring “far and near integration, soft-kill combined with hard-kill, acoustic and magnetic integration”. And the underwater and water-surface universal technology will be fulfilled in the future. Via the trial test, the typical multi-combined countermeasure technology is validated to be mature and reliable. The development trends are also discussed.