Abstract: In order to investigate relations of primary and secondary on main agronomic characters which influencing fresh ear yield of super sweet corn inbred line. The data were analyzed by multiple statistic methods. It was tested to plant height, ear height, leaf number, stem diameter, bare top length, ear length, ear diameter, ear rows, kernel per row, 100-kernel weight, percentage of kernel and fresh ear yield which 12 traits of 30 super sweet corn inbred lines involved were tested and principal component analysis was performed for them. Principal component analysis showed that the first 7 principal components characteristic values reach over 85% in their accumulative contribution rates, these principal components values will represent the genetic characteristics of 12 characters. The first 7 principal components might be regarded as fresh ear yield factor, ear rows factor, ear diameter factor, kernel weight factor, plant height actor, stem diameter factor and bare top length factor. That represented the comprehensive indexes of the experimental inbred lines. The above results could underlie comprehensive multiple character selection for super sweet corn inbred lines.