Conversion of torpedo's environment factor for lake and sea test based on small sample system

There is a little information of torpedo's lake and sea test, and the torpedo's life doesn't obey representative life distribution. It can't reflect the actual condition that the conventional methods are used to convert the environment factor for torpedo's lake and sea test. The conversion model of the environment factor for torpedo's lake and sea test was set up by using the GM (1, 2) model of the grey system theory. For the merit of the grey system theory, the problem of lacking data can be solved. The results show that the method is easy, realistic, and has high conversion precision, which can be taken as good references.