Abstract: 【Objective】 To assess the synergistic effects of synergists on herbicides in spring wheat aiming to provide the basis for the safe and efficient application of herbicides. 【Method】 Randomized block design was used to research the number and the fresh weight of weeds at fixed spots, and the synergism and safety of florasulam·halauxifen-methyl in controlling broad-leaved weeds in spring wheat field was evaluated. 【Result】 The control effects of 20% florasulam·halauxifen-methyl WG with methylated vegetable oil, vinyltriethoxysilane or organic silicon on broadleaf weeds in spring wheat field were 95.63% - 100.00% and 96.91% - 100.00%, respectively, which were significantly higher than those of 20% florasulam·halauxifen-methyl WG.However, there was no significant difference in the control effect of different treatment added synergist.The yield increased by 5.33% - 6.29% and the benefit increased by 819.44- 964.54 yuan/hm², but there was no significant difference among the treatments. 【Conclusion】 20% florasulam·halauxifen-methyl WG 15.00 g/hm² + methylated vegetable oil 225.00 g/hm² or vinyltriethoxysilane 67.50 g/hm² or organic silicon 225.00 g/hm² can be used to control broad-leaf weeds in spring wheat field.