Iron oxides in the soil clay and coaser fractions of three vertical soil zones of Fujian Province were studied by Mössbauer spectroscopy, chemical analysis and microscope examination. The results showed that from yellow soil to yellow-red soil to red soil to lateritic red soil,hematite increased gradually while goethite decreased gradually; the combination of iron oxides in the coaser fraction became more and more simple.From yellow soil to yellow-red soil to red soil, the free degree of iron and the ratio of crystalline iron oxide to colloidal iron oxide increased gradually while the activity of iron oxide decreased. However, lateritic red soil was an exception, which may be attributed to its young age. It is suggested that the relarive contents and the status of the iron oxides can reflect the stages of soil weathering and soil formation. Some problems concerning soil classification were also discussed.