Abstract: Cyromazine,an environmental benign pesticide with high potency and low toxicity,was used for prevention and cure of plant diseases and insect pests resulted from dipsters.One-pot reaction,with 2,4,6-trichloro-1,3,5-triazine as raw material,of cyclopropylamination and amination provided the intermediate(6-chloro-2-cyclopropylamino-4-amino-1,3,5-triazine),another amination under pressure yielded the target compound.The total yield was 72.1%.