Abstract: In the paper the atomization behaviours of Al, K, Ag and Cd in the ordinary graphite and the glassy carbon tube are studied. The experiment showed that the slopes of calibration curves established for Al, K, Ag and Cd in the glassy carbon tube are larger than those in the graphite tube.Therefore, the analytical sensitivities of the elements are increased by using the glassy carbon as heated tube. The influence of the heated tube material on the shape of the absorption charateristic curve and on trailing phenomena of the signals, occured in the glassy carbon and the graphite tube, are related to the nature of elements. The trailing of signal for Ag and Cd did not appear in two heated tube, But the trailing of the signal for Al and Ktaked place in two heated tubes.