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For solving the problem of the multi-targets threat from the air, this paper analyzes the threat degree of many kinds of different moving stages in naval gun system. The authors analyze the drawbacks of previous methods and provide a new analytical model which is based on the theory of grey correlation and correlation coefficient. Using the new mathematical threat degree analysis model, the authors verify the new model by practical experiment and practical applications. In addition, this paper compares the merit and demerit of traditional method and the new method of analytical model. It turned out that the new model is better than previous ones and it can be used effectively and easily, and its consumption of system recourse is in theoretical range.