Abstract: The residual dynamics of Difenoconazole and Propiconazole in rice plant, soil, water samples, experiments conducted in Hunan ,Zhejiang and Jilin Province, were studied by ECD Gas Chromatography．Samples were extracted with acetone and dichloromethane, followed by determination using ECD GC. The result showed that the recovery rate of Difenoconazole were 84.3％~97.9％ for the rice plant, the water and the soil samples with coefficients of variation of 2.89％6.78％; and that of Propiconazole were 83.6％~104.7％for the rice plant, the water and the soil samples with coefficients of variation of 4.02％~6.57％. The minimum detectable concentration of Difenoconazole was 0.002mg/kg for water samples, 0.01mg/kg for soil samples and 0.02mg/kg for rice plant; and that of Propiconazole was 0.001mg/kg for water samples, 0.005mg/kg for soil samples and 0.01mg/kg for rice plant. Three experiments conducted, the degradation half-life of Difenoconazole within the rice plant was 6.92~13.6days, within the water samples was 0.37~0.76 days and within soil samples was 23.98~33.49days， respectively; and that of Propiconazole within the rice plant was 2.55~6.31days ,within the water samples was 0.28~4.33 days, and within soil samples was 17.59~35.91days, respectively. The MRL values of Difenoconazole and Propiconazole were all sdvised to being setted to 0.10mg/kg. Difenoconazole and Propiconazole was not detectable in ripe rice with once prescription of Difenoconazole?Propicondzole EC in the condition of Chinese natural environment