Abstract: Actinide chemistry in geological system related to the underground disposal ofradioactive waste is briefly reviewed in this paper. It includes: (1) character ofgeological system, (2) research on the migration of actinide nuclides in geologicalsystem, (3) valence states of actinide elements, (4) complex formation. (5) forma-tion of colloid and (6) analytical methods of actinide elements.