Abstract: Based on a comprehensive analysis of data from large amount of seismic, well log and drilling in Langgu depression, this paper discusses the structural history of the depression and its evolution. In the period of sedimentation of the 3rd member of the Shahejie formation, the accompanying block faulting being tilted towards NW a series of structural zones developed with striks in NE direction, such as reverse drag fold, central graben zone...etc. By the end of the deposition of the Dongyin phase, because the tilting of fault blocks was changed from NW to north direction, structures trending in NWW direction were produced. Meanwhile, a distinct structure frame work with stack of those resulted in two periods had been formed. In order to expound and hold the origine of different structurAL zones and local structures, some simple and inexpensive laboratory simulation tests in clay models and correspounding numerical simulation by finite element method are carried out. The results from these two modelings show that structures in the southern part of the depression are mainly dominated by gravity slippage, while in the northern part, both gravity slippage and horizontal right-hand torsion dominated the structural styles.