In this experiment,8 popcorn inbreeds which have remarkable genetic difference were selected to make crosses by method Ⅱ of Griffing.Systematic investigation and study had been done for 36 materials harvested previous year and studied the parentage regression and correlation of seed expansion times characters and correlation and path analysis between times of seed expansion character and other characters.The results indicated:significant positive correlation generally existed between F 1 generation and parents,correlation level of female parent was higher than that of male parent.Genetic correlation analysis showed:There was highly significant positive correlation between times of expansion and row number of ear,height of ear,negative correlation between times of expansion and length of bald,weight of 100 grain and stem wide,and remarkable positive correlation between times of seed expansion and axes wide,ratio of expansive grain and plant height.Axes wide,weight/stem,ratio of bold,weight/axes and yield/plant had more direct and indirect effect on times of seed expansion.