Based on the radio-carbon dating, spore-pollen analysis, and physical and chemical data of some heilusol profiles in the loess plains of the eastern Gansu Province, this paper deals with the pedogenesis and evolution process as well as the laws of time-space variation of soil-forming intensity of heilusol. Heilusol profile is composed of some overlapping soil genetic horizons formed in different soil-forming stages with diversified properties. The formation of overlapping profile of heilusol successively underwent paleosol developing stage, Holocene loess accumussting and covering stage, and artificial cultivating, manuring and maturing stage. The overlapping feature in the appearance of heilusol profile and some compound genetic phenomena in the buried argillic paleosol horizon reflects an overlapping function of different soil-forming processes which occurred before and after the paleosol was buried.