Abstract: Based on the selected eggplant inbred lines with different nitrogen use efficiency (NUE), the combination ability was analyzed with 7 inbred lines under high Nitrogen(450 kg/hm2 )and low Nitrogen(no N)by Griffing-II design. The results showed that, at two N levels, NUE was controlled by additative and non-additative effect, and total N and N utilization efficiency (NUtE)were controlled mostly by additative effect.609 and 749 inbred lines had higher general combining ability of nitrogen use effieiency at two N levels. Under low N stress, the heritability in the broad-sense of NUE characters increased while heritability in the narrow-sense of NUE characters decreased.