This article studies the method for determination of Nickel and Lead in hogwash oil by graphite furnace atomic absorption spectrometry with graphite digestion. The digest reagent, matrix modifier, ashing temperature, and atomization temperature are being optimized. Results showed that the detection limit of Nickel and Lead are 0.03 and 0.10 mg/kg, respectively. The results of recovery and RSD are satisfactory, indicating that this method is feasible for determination of Nickel and Lead in hogwash oil.