Abstract: In order to screen out the most suitable concentration of tebuconazole in controlling strawberry seedling growth, ‘Hongyan’ strawberries were sprayed with five different concentrations of tebuconazole（C1 : 2.52×10^-6 mol/L, C2 : 5.04×10^-6 mol/L, C3 : 7.56×10^-6 mol/L; C4 : 1.01×10^-5 mol/L, C5 : 1.26×10^-5 mol/L）, and with water as the control, the effects of different treatments on plant height, stem diameter, leaf area, chlorophyll content, net photosynthetic rate and biomass of strawberry were measured at 5,10,15,20,25 and 30 days after spraying. The results showed that the growth of plant height and leaf area of strawberry was significantly inhibited after treatment with different concentrations of tebuconazole, and C4 had the best inhibitory effect. The total net increment was 78.32% and 83.55% lower than that of CK, respectively. Within a certain range of concentration, the stem diameter could be increased, but the difference was not significant. C1 had the best promotion effect on stem diameter, and the total net increment increased by 36.95% compared with CK. In terms of physiological indexes, the chlorophyll content of C2 increased the most compared with CK at 30 d, but there was no significant difference between C2 and CK. C4 significantly increased the net photosynthetic rate. The application of tebuconazole reduced the dry and fresh weight of the plant, but increased the root-shoot ratio. The root-shoot ratio of C2 was the largest, but the difference is not significant. The seedling index of C2 was the highest, which was 10.69% higher than that of CK. The comprehensive analysis of membership function showed that C2（tebuconazole 5.04×10^-6 mol/L）had the best control effect on strawberry growth.

Key words: strawberry, tebuconazole, seedling, quality