Because of our national conditions, special diplomatic, political and economic background, the acquisition of military force is very difficult. How to use the limited budget to maintain the warship force has become an important military issue. As an example, as an example, according to the cost of the whole life period, the factors such as "water quantity", "maintenance cost", "operator demand", "proper rate", "service life", "annual consumption cost" are the independent variables, and "construction and reform" are the independent variables. The result of analysis is that the "water production" affects the "structural change" most significantly, so if the water demand is lower than the demand, then the implementation of structural modification should be considered.