College of Earth Sciences, Jilin University, Changchun 130061, China

Based on the research in black soil in Siping area, three points with different parent material profiles were sampled. Through testing the contents of trace elements and constant elements of the samples, and analyzing the data by the means of longitudinal and transverse analyses, the results show that the contents of geochemistrical elements have great discrepancy in different parentmaterial layers. Though there are inheritance characters in the black soils in surface, the contents of soil geochemical elements have changed in the same climate and vegetations for a long time, and the geochemical characteristics of the black soils in different parent materials incline to coherence.