Abstract: The method of Monte Carlo is usually used in calculating the insinkability probability of the warship, especially in one dimensional space. In order to develope a new method in three dimensional space, the warship＇s surface is divided in many small triangles. The paper study how to apply the method of Monte-Carlo to calculate the insinkability probability of the warship in any attack angle. In the end, the difference between the results of this method and the preceding method is compared and analyzed.