Abstract：The commonly grown eggplant（Solanum melongena L.）cultivar‘Xi’anlvqie’was used as scion. It was grafted with eggplant rootstock（Solanum torvum）．Growth and nitrogen metabolism enzymes activity of grafted eggplants and self-rooted eggplants were determined under 6 different nitrogen concentration（0，7.728，15.456，30.912，61.824，123.648 kg•hm-2）and the different growth stages in same nitrogen concentration（30.912 kg•hm-2）．The results showed that under different nitrogen conditions，the plant height，stem diameter，biomass of grafted eggplants were higher than self-rooted control by 9.17%-28.75%，10.90%-26.18%，36.00%-92.83%，and when the nitrogen concentration was 30.912 kg•hm-2 that the difference was at very significant level．Grafting could increase the eggplant nitrate reductase（NR）activity．When the nitrogen concentration was 30.912 kg•hm-2 the glutamine synthetase（GS）activity was the highest value，and grafting could reduce the activity of glutamate dehydrogenase（GDH），but the difference was not significant．After flower budding stage，the plant height，stem diameter and biomass of grafted eggplants was notably higher than that of self-rooted eggplants．NR and GS activities increase with the plant growth，and the grafting eggplant is obviously higher than the self-rooted eggplant．
