Abstract: Application of agricultural standard method NY/T 761-2008,matrix effects of organophosphorus pesticides have been studied in fruits and vegetables by GC-FPD in this research. 15 kinds of samples determined to have no pesticides by GC-FPD were selected,and 30 kinds of organophosphorus pesticides standard were mixed in the 15 kinds of samples matrix at 4 different concentrations levels.And they were compared with the same concentration levels of pesticide standard solution with pure acetone as solvent. Results showed that 15 kinds of samples had different degree of matrix enhancement effect or weakened effect on 30 kinds of organophosphorus pesticides,The intensity of matrix effect were bound up with the types of sample and pesticide.The strength of the polarity and had no obvious linear relationship with the concentration of pesticide, but a small number of the matrix effect of pesticide has a tendency to first increased and then decreased with the increase of mass concentration. It is recommendable to apply the matrix-matched external standard method on the determination of organophosphorus pesticides in real samples; Melons and bud vegetables have less. It is speculated that according to the moisture content to categorize fruits and vegetables and selects the general matrix instead of different kinds of vegetables to prepare standard solution. This method would greatly reduce matrix interference and improve the efficiency and accuracy of inspection.

Key words: organophosphorus pesticides, fruit and vegetable, gas chromatography, matrix effect