Starting from the attack decision criterion of submarine-launched torpedo and the requirements of battlefield usage of wire-guided torpedo,the necessary conditions of attack decision for wire-guided torpedo are put forward to meet the specialty of guidance methods of wire-guided torpedo.Based on these conditions,the problems concerning the battlefield usage of wire-guided torpedo are discussed in detail.

Under the restriction of self-directed approach in the process of sound-homing torpedo continuous shooting,the inappropriate divergence angle will lead to mutual guiding.The advantages will not be demonstrated properly,as large attacking range,high hitting probability.In this paper is discussed the best fire position of sound-homing torpedo.And also solved mutual guiding in continuous shooting by researching the parameters of fan launching.The distance from the lead role and hit probability are improved,as well as the method of continuous shooting is optimized.Some of suggests will provide a reference in firing.