Abstract: Abstract: At the lower generation（C5）of the autotetraploid eggplant, plant shape index and the ratio of the well-balanced plants (9.19%)are low. The average shape index for 12 strains of the three different female parents is 0.4779. But it’s genetic rate is : h2B = 96.39% ±3.52%. Plant shape index shows strong minus correlation with average fruiting ability, it’s relique interrelated coefficient is: rg=-0.9989 and correlative heritability is: hxy= -95.22%.Going with the increase of recurrent generations and augment of genetic stability, plant shape index shows strong linear positive correlation not only with total yield(rg=0.8871，hxy=86.18% ) but also with prematurity which can incarnate the prophase yield（rg=0.9592,hxy=93.64%）. The shape index shows strong genetic correlation with plant height, stem width, plant diameter, foil index and the first node.The genetic ability and it’s indirect seletion rate show as the followings:fiol index＞ plant diameter＞ the first node ＞stem width ＞plant height.Among these numerical values, plant height, stem width and the first node are negative, but the foil index and plant diameter are positive, as same as the seletion direction. Key words: autotetraploid；eggplant；shape index；genetic variation；correlative selection