Abstract: Using Zinnia elegans Jacq.as experimental material， the effects of spraying different concentration of gibberellins（GA₃）， brassinosteroid（BR） and different dilution multiples of pollen ferment for two times on the florescence and flower quality of Z. elegans were studied. The result showed that spraying GA₃ can advance the florescence of Z. elegans， extend the flowering period； spraying BR and pollen ferment within a certain range can delay the florescence of Z. elegans. All three growth regulators can increase the number of flower diameter， leaf area， height and flower number of single plant and raise ornamental values of Z. elegans. According to overall consideration of multiple factors， of three plant growth regulators， the treatment with 0.02 mg/L of brassinosteroid was the best， followed by 800 times dilution of pollen enzyme； while the concentration of gibberellin might be appropriate at 100 mg/L.

Key words: Zinnia elegans Jacq., plant growth regulators, florescence, flower quality