Abstract: The study aims to provide reference for evaluating, classifying and genetic improvement of seed vigor of sweet corn. Ninety-five sweet corn inbred lines were tested under standard germination, cold test (CT) and artificial aging (AA) treatment. Seven indexes, including germination rate (GE), seedling height (SH), root length (RL), relative germination rate in CT (CRGE), relative germination rate (ARGE), relative seedling height after AA (ARSH) and relative root length after AA (ARRL), were measured. The comprehensive evaluation of seed vigor was done by membership function method and multiple statistic analysis. The results showed abundant genetic variation of seed vigor exists in sweet corn germplasm. The coefficient of variation of seven indexes ranged from 14.42% to 34.46%, and the total contribution rate reached to 71.27%. A mathematical evaluation model for seed vigor was established by stepwise regression equation: Yvigor=-2.596 1.626GE 1.07ARGE 0.628CRGE (R2=0.900), and the predictive values (Y) were basically consistent with the mean value of subordinate function (L). Finally, 95 sweet corn lines were divided into five grades based on comprehensive seed vigor value. GE, ARGE and CRGE can be used as main indexes to evaluate seed vigor of sweet corn.