Abstract: The Tanlu Fault (TLF) is a very important tectonic line in eastern China. It plays a very important role in the evolution of western Pacific plate. TLF has close relation with the distribution of oil/g as fields of eastern China. But there is no detail research about the segment of T LF in BoHai bay, based on geophysics data. This paper studies the relationship between the T LF and Bohai basin and the structure character of TLF in Bozhong sag. Also this paper analyses the relation between the evolution of TLF and hydrocarbon reservoir in Bozhong sag.