The boundary fault of eastern graben,the Tan-Lu Fault Zone,is the main boundary fault which plays an important role in the evolution of the fault zone and present structural framework. The research on the Quaternary activity of the boundary fault of the eastern graben is helpful to understand evolutionary history and seismicity of the Tan-Lu Fault Zone. However,the study on the two boundary fault is rare and inclusive. Based on shallow seismic exploration and composite drilling section,this paper systematically researches the Quaternary activity of the boundary fault of the eastern graben in the Jiangsu segment,the Tan-Lu Fault Zone. The result reveals that there is no evidence of tectonic movement since the Quaternary period along the Changyi-Dadian Fault(F₁). Nevertheless,Baifenzi-Fulaishan Fault(F₂)exists in the tectonic movement during the early Quaternary period.