Abstract: The computerized tomography(CT) is applied to obtain CT images at different depth of the stable unsaturated sand specimen by scanning each layer of the specimens.The CT images are transformed into mean CT values by the Image J software.This paper also introduces a new CT method to study pollutant migration in unsaturated sand by scanning the specimens,in which the pollutant potassium iodide(KI)solution are injected by the interval continuous method.CT images are measured with different time inte...