Abstract: The development of the theory of the Cathaysian flora has experienced four phases since 1962.Its geographical range has extended to three regions and 32 provinces which distribute in the areas of Eastern and Southern Asia, Indochina and groups of islands on the Pacific.This dissertation focuses on the argument about the causes of the geological formation, paleogeography and organisms on groups of islands on the Pacific, which do not have any relation with the theory of Cathaysian Paleocontinent (or "the Platform of South China"). There are many conspicuous variations between the formation and development of the flora and species distributions in the above-mentioned areas.

Key words: Cathaysian Regnum vegitabile, Groups of islands on the Pacific