Soil geology is alsomaking new progresses alongwith other disciplines. Based on the review in this paper of major research fields of soil geology,such as soil parent material and soil quality,soil parent material and soil classification,soil geology and agriculture/farmng structure,geological background and soil geochemical cycle,etc.,relationships of soil geology with soil science,geology,environmental geology,agricultural geology,land science and other disciplines,are analyzed;and key research fields and direction of the development of soil geology in future are discussed in a view to promoting development of the study on soil geology.