Study on the eight magnetic parameters including magnetic susceptibility, frequency dependent susceptibility, saturation remanence, etc.) of soils derived from carbonate rock in Guizhou showed that the magnetic properties and changing characteristics of soil were significantly affected by the pedogenic environment and process, and these properties were of important environmental sigificance. On the basis of high-gradient magnetic separation of iron oxide minerals from the soils, systematic studies have been made on the soil magnetic properties and magnetic minerals by using X-ray diffraction, microprobe analysis, transaction electron microscope and Mossbauer spectrum.