In the past twenty years, more and more Pt1 and Ar geo-information was found in Southeast China, and the geo-information concentratedly obtained around the Wuyi uplift is called "Wuyi geo-information". The "Wuyi geo-information" manifested in different geophysical fields shows that there are several remaining continental nuclei in this area. Based on a synthetic analysis of some kinds of geophysical fields, the authors hold that there exist several remaining continental nuclei in Southeast China, and the Cathaysia was formed by the accretion of many remaining continental nuclei.