Abstract:Through optimizing the experimental conditions of digestion reagent，digestion condition，matrix modifier，ashing and atomization temperature，a complete experimental method for determination of Pb in Zhaoshi nuts by graphite furnace atomic absorption spectrometry （GFAAS）was established，the results indicated the concentration of Pb in the 0-50 μg /L range with a good linear relationship between absorbance，linear equation y=0.002 41x，the correlation coefficient r=0.999 469，the detection limit was 0.485 μg /L.The content of Pb in zhaoshi was 0.081 mg/kg，relative standard deviation of repeatability was 3.43 %（n = 5），recovery was 95.3 %- 7.1 %.Standard addition recovery，repeatability and quality control verification test showed that the method for determination of Pb content in Zhaoshi by GFAAS was accurate，stable and reliable.