Abstract: In order to evaluate environmental safety and establish safe applied standard, using field experimental method, residue dynamics and final residue of phorate granules (5%) in sugarcane and soil were studied. The method for direct determination of phorate and the method for oxidation of phorate and its metabolites with potassium permanganate were developed .The degradation and residue of phorate in sugarcane and soil were determined by gas chromatography with flame photometry detector. The results showed that the half-life of phorate in soil was 11~12.3 d. Finally, phorate would not lead to residue contamination in sugarcane and residue accumulation in soil under normal applying condition.