Abstract: The potential application factors affecting primary residues of triazophos in rice including dosage,dilution ratio,formulation type,application times and stages were studied in a series of indoor simulating trials.Besides,the effect of application of triazophos in rice during the booting stage on formation of triazophos residues in brown rice was also examined.The results indicated that the main application factors were dosage,dilution ratio and application times.Primary residues of triazophos was positively correlated with dosage and negatively correlated with dilution ratio,and the linear equations had been obtained as y=0.883 1+0.352 7x(r=0.982 2) and y=110.21-0.200 5x(r=0.986 2) respectively.In addition,primary residues of triazophos increased significantly with the increase of application times.Bagging treatment effectively repressing formation of triazophos residues in brown rice was highlighted.