Abstract: Kinetics of triadimefon hydrolysis was studied in water different in pH value and temperature.The results indicate that triadimefon was stable in acidic environment,but its hydrolytic rate accelerated with the rising pH value.Higher temperature was helpful to the hydrolytic process.The activation energy for hydrolysis of triadimefon was the highest in acid water,whereas the effect of temperature on hydrolytic rate was the greatest.