Abstract: In order to explore the influences of the different digestion methods on measuring the content of heavy metal in soil,in this experiment,two different digestion methods,the wet-digestion and high pressure sealed digestion methods,were used to measure the content of Cd,Pb,Cu and Cr in the standard soil of Sichuan Basin by adopting atomic absorption spectrometry.The result showed that (1) the wet digestion and the high pressure sealed digestion methods were able to digest Cd,Pb,Cu and Cr.The sample detection was all below 0.05 μg·l^-1; (2) The effect of the high pressure sealed digestion methods was better than that of the wet digestion method,and the relative standard deviation or accuracy of high pressure hydrothermal decomposition was more trustful than that of the wet digestion; (3) the high pressure sealed digestion method was effectively able to control the sample loss and more simple,time-saving,even to reduce the using of acid and environmental pollution.Thus the high pressure hydrothermal decomposition method would be used as a practicable method of analyzing the content of heavy metal in soil.