Abstract: In order to develop low toxicity and environmental friendly botanical pesticides,and biocontrol the rice false smut in saline alkali soil,chelerythrine and salt tolerant rice variety Tongxi 926were used as materials to screen suitable additives,and finally developed a suspension pesticide formula with chelerythrine as the main component.We also compared the field control effects of different concentrations of suspension agents on rice false smut in saline alkali soil.The results showed that the suspension pesticide sprayed twice had a good field control effect on rice false smut.When the effective component was 192 mL·ha-1,the control effect was95.88%,which was higher than that of the control agent.It had the characteristics of low residue,environmental friendliness and so on.