| China, as a strong country that is close to sea, its security of sea is tied tightly to country's security advantage, at that, the warship is important for protecting coastal security. With the development of technology rapidly, it is more and more harsh to warship's vitality due to modern warship's weaponry more and more excellent; the structure more and more complex; the cost more and more higher. In this paper, by calculating the residual strength after the hull is damaged by weapon, the hull's security is assessed in kinds of damaged situation, at the same time, the effected parameter of residual strength and susceptibility are studied.There are mainly items in this paper. Firstly, the statistics is made to the damaged position and dimension of hull damaged by bombs, guided missiles and torpedoes. According to the different damaged position, it is divided into two parts to calculate—water and underwater: in the situation of water, it is only considered the change of sectional data in the damaged position; in the situation of underwater, it is also considered the buoyancy curve when ship's hold is full of water and the change of lateral angle.Secondly, the loading calculation is carried on for damaged hull. During the calculation, the change of external loading curve is considered with Vlasov calculation method. The different stresses of damaged hull are calculated using transfer matrix method based on modified thin-wall beam theory.Lastly, the reliability of warship is evaluated in different damaged situation on the basis of calculation on limit strength, meanwhile, the effected parameter of damaged hull's residual strength and susceptibility are analyzed and calculated.
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