Torpedo is one of the main threats to surface ships. How to effectively defend against modern torpedo attack is a problem that all navies must pay attention to. Compared with surface ship missile defense,the complexity of underwater combat space brings more challenges to underwater torpedo defense. The successful defense of surface ships against modern torpedo attack requires not only the use of soft and hard killing means for multi-level defense,but also the attack on submarines. Challenges brought by the diversity of defense objects and the relevance of defense means are analyzed. The outstanding problems restricting the effectiveness of integrated torpedo defense at present are discussed. Solutions from the aspects of enhancing situational awareness,improving defense means,and optimizing decision implementation are put forward. Integrated torpedo defense can not only improve the success rate of single torpedo defense,but also affect the subsequent torpedo attack through the transition of attack and defense,and significantly improve the survival probability of surface ships.