Abstract: Trace amounts of aluminum in rat brain was determined by graphite furnace atomic absorption spectrometry with a transverse heating graphite atomizer (THGA) and an axial Zeeman effect background correction system.Experimental conditions were optimized.An autosampler was used on-line in all experiments for adding solutions of samples,standards and matrix modifier as well as for preparation of working curve and recovery test.The method had a charecteristic sensitivity of 26.2 pg,detection limit of 11.6 pg,values of RSD of 3.8% and recovery of 91.6%-98.2%.