Abstract: According to tactical requirements of operational application for torpedo weapon and technical conditions of guidance and control for wire-guided torpedo, we analyze the influence of torpedo′s radiation noise and velocity on the operational application, and discuss the importance and necessity of adopting multispeed for a wire-guided torpedo. Simulation shows that if the advantage of torpedo velocity can not be taken effectively, huge limitation still exists in torpedo′s operational application in spite of the multispeed. In order to improve the tactical efficiency of the wire-guided torpedo with multispeed, the torpedo launch platform should offer some different guidance methods, so that the torpedo may take shorter time to approach the target with high speed, and keep lower radiation noise to make better use of the sonar detection with low speed. In addition, we indicate some problems to be solved in application of the alternative high or low velocity guidance method.