Aim at the characteristics of mixed oils with more components and large interference fromimpurities,A method for the determination of lead in complex oil samples by graphite furnace atomic absorptionspectrometry with pressure microwave digestion was developed.The optimum conditions of graphite furnacewere obtained that the matrix modifier was 3 μL mixed solution of NH?H?PO?(1%)/Mg(NO?)?(0.05%),theash temperature set to 550 ℃ and an atomization temperature set to 1700 ℃.The results of performance testwere as follow:in concentration range of 0~80 μg/L,the linear equation is y=0.0028x-0.0002 which r2was 0.9979,and the range of standard recovery rate was 95.5%～103.4%,and the relative standard deviation(RSD%)was 0.31%~2.13%(n=5).These results of performance test showed that the built method had agood linear relationship with high accuracy and precision.The proposed method was used to analyze the leadcontent of 8 oil samples,and the practical results showed that the proposed method can accurately determinethe content of Pb element in complex oil samples.