Abstract: In order to utilize the new sweet corn population sufficiently and accelerate the course of breeding. According to incomplete diallelcross，2 core inbreds choosed as testers,75 plant lines hybridized with the testers, 150 combinations achieved. Analysis on the combining ability and genetic potential of the population through combinations identifying、the evaluating and identifying of plant lines’ edible quality and fastness etc. the results showed that 36 plant lines of the population had positive GCA, in the same time, the proportion of plant lines which had good GCA approached or excessed 50% on the correlative traits of yield、merchandise traits and agricultural traits. Combining the performance of themselves, we choosed 9 eminent plant lines and achieved 8 excellent combinations according as the result of combinations identying. The result showed that the population had abundant favorable genes and genetic variance according to the performance of plant lines’ combining ability and population itself, thereby the population had good utilizing potential.