In the light of the theory of material differentiation,this paper describes the transformation of crustal types from one into the other and discusses the fundamental characteristics of crustal evolution in southeast China. On this basis,southeast China is divided into different crustal divisions,and the relations between tectonic feature and seismology are discussed.
The results show that material differentiation has been taking place only weakly in major deep fracture zong of southeast China inland,resulting in a low intensity of fracture activity and in the qui-escency in seismicity;whereas in the eastern part being close to the subduction zone of Philippine Plate,material differentiation is strong,fracture activity and seismicity are significantly strengthening.