Abstract: For the study of different plant growth regulators on the yield and quality of eggplant, in this study, the eggplant was added to three different kinds and concentrations of plant growth regulating agent included sodium nitrophenolate, DA-6 and NAA and irrigated with the nutrient solution. Measured on the ground and below-ground growth indicators, yield as well as quality, when the eggplant grown in the greenhouse to maturity. The results showed that 0.02% sodium nitrophenolate could promote the plant height, leaf number, chlorophyll content and root length. 0.01% DA-6 could promote plant biomass, stem diameter, leaf area, root length, root dry weight and fruit production, the compound of 0.02% sodium nitrophenolate and 0.02%sodium alpha-naphthalene acetic acid could improve the content of fruit yield 36.9% and the contents of vitamin C, soluble sugar, over sized fibers and crude protein 33.35%, 23.4%, 42.12% and 29.5% respectively compared with the control..