Abstract: Rapid development on geological tectonic theories and measurement techniques recently enriched the information and isotopic dating data on geological tectonic research of south China, and provided more scientific evidences for further understanding the geological structure of this region. This paper presents correlative data of Yunkai Mountain and northern Fujian and new idea in geological tectonic framework of South China. Our results confidently show the existence of the Cathaysia block, nevertheless, its distribution scale needs to be discussed.The basic tectonic framework of the South China is featured by two contionentall blocks intervening one oceanic basin. The Yangtze block combined with the Cathaysia block during the Jinning movement, and the intervened oceanic basin wrinkled during the Caledonian movement and the South China since then became as a unified continent. The geologic of the South China developed into one new stage in the Hercynian-Indochina period.