The leading industries are dominant in industrial system of the industrial park. In view of development characteristics of the industrial park, the selective standard of leading industries legitimately is set as well as index system of industry evaluation is constructed scientifically. By using the principal component analysis method, with the case on Zhuzhou Tech Industrial Zone, evaluation on the industrial scale, expansion ability, market competition, innovation and social benefits have been scientifically determined by leading industries in order to establish the industries system of close cooperation and distinctive characteristics. Finally, suggestions are proposed including industrial cooperation, innovation and capital attraction etc.