From the perspective of submarine anti-torpedo defense，this paper mainly introduces and analyzes the tactical background，the development status of countermeasures and the future development direction of submarine anti-torpedo defense. In view of the torpedo and anti-submarine threats faced by submarines，this paper summarizes the characteristics of submarine active and passive defense technologies， and focuses on the consideration and envision of constructing a network-centralized，multi-level，multi-platform and intelligent integrated defense system of submarines for future anti-submarine combat needs，which provides an important reference value for the development of submarine underwater anti-torpedo defense technology and system construction.
