【Abstract】 Janpan has a huge economic resource. The Japanese manufacturing has enough capital, advanced technology and the annual GDP and export production are forefront in the world, Japan's private enterprise has sophisticated division, large-scale and if part of the production capacity for weapon production, Japan's military capacity will be forefront in the world.Quantitative description and compared with others can present the potential of Japan's defense economic. After making a model of estimating the potential of defense economic and determining the weight coefficient of factors which determines the potential of defense economic by AHP, taking US's data as the reference and the potential of Japan's defense economic may be estimating by non-dimensional indicators. Through a comparative study can not only see rankings of the potential of Japan's defense economic in the world, and we can see that the potential of Japan's defense economic compared with other countries.The potential of Japan's

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