The type of weathering experienced in Gaoyou Sag of Subei Basin was mainly physical weathering, while the degree of chemical weathering was weak. The most part of south steep slope experienced relative sthonger chemical weathering than north gentle slope, which indicate warm and humid climate relatively. North gentle slope, Huangjue and Shaobo area experienced stronger physical weathering with larger territorial difference relativly than south steep slope, that indicate experiencing strong tectonic movement. Mother rock of investigatory is mainly felsic rock and recycling sedimentary deposit, contain little medium and basic material. The lower 1st Dainan formation in the margin of Gaoyou Sag and its neighbouring Wubao uplift contained marine chemical features that are similar to underlying Funing formation. We deduce that the large part of provence in studied area come from denuded original basement and recycling sedimentary deposit. No matter in geologic history or present situation, Subei Basin shoule be associated with the trench-arc-back arc system (continental island arcs) or the discrete continental margin (passive continental margin). However, tectonic setting of studied area which based on the chemical data is included in Andean type continental margin. We think that this tectonic setting of Subei Basin can reflect the especial terrain feature in east China. The concept of “active continental margin”in east China differed from the typical Andean type continental margin in South America, because of the difference between these two distant areas no matter in geologic history or dynamic mechanism. The complex continental margin in east China does not suit to the foreign simple classified patternes of tectonic setting, that shoude be included in another type of tectonic setting called“the type of terrain aggregated margin”.