Abstract: 【Objective】 To explore the effects of different concentrations of brassinolide and spermidine on the growth and yield of sugarbeet. 【Method】 Under the condition of drip irrigation and fertilization in Ta'e area, the field spraying experiment was carried out with sugarbeet Beta 796 as experimental material, and eight spraying treatments were set up (CK: clear water control;BR:0.1 mg/L, 0.2 mg/L, 0.3 mg/L;SP:35 mg/L, 70 mg/L, 105 mg/L;BR+SP:0.2 mg/L+70 mg/L) to study the effects of different concentrations of brassinolide and spermidine on plant height, leaf photosynthetic performance, chlorophyll content, dry matter accumulation and yield of sugarbeet. 【Results】 The results showed that the leaf number, plant height and chlorophyll content of 0.2 mg/LBR compared with CK increased by 20.7%, 25.72% and 39.13% respectively, net photosynthetic rate and transpiration rate increased by 33.88% and 71.03%, total dry matter accumulation increased by 61.27%, yield and sugar yield increased by 32.31% and 23.82%, respectively.The plant height of 105 mg/L SP treatment increased by 9.53%, the beet top ratio at harvest decreased by 11.45%, the yield increased by 12.71%, the sugar content increased by 0.98%, and the sugar yield increased by 13.78%. 【Conclusion】 Spraying 0.2 mg/L brassinolide can promote sugarbeet growth and increase sugar yield and sugar yield and spraying 105 mg/L spermidine can increase sugar content and sugar yield of root tuber.Under the experimental conditions, the compound combination does not have a better effect.