Trace elements including Si, Fe, Mn, Cu, Zn, etc.in 6 purple rocks and soils derived from the rocks in Sichuan were studied. Data obtained revealed the despersion and enrichment characteristics in the process of rock formation and soil genesis and the inconformity of the total content to the available contents of the elements. It is suggested that the geochemical gradation of these elements in the soils based on thfir available contents may be used as the indexes for trace element fertilization.