It was introduced that the quantitative analysis of carbofuran and thiram? triadimefon in seed dressing by reserved phase HPLC with hypersil C 6H 5 column.The mobile phase was mixture of methanol and distilled water.The standard deviation was 0.11,0.04,0.05,the coefficient of variation were 0.74,0.37,0.48.The recovery rate of the two ingredients were 99.6%~101.0%,98.4%~100.6%,99.7%~100.3%.