Abstract: Transfer structure developed in different types of basin. The inherence of the structure is various deformation of basins under regional stress field. It was always formed with several faults or folds in strike directions and displayed the transformation between each other. Because of the complex feature of the structure, it is difficult to be described. Using 3D seismic data could not only enhance the quality of the profiles, but also provide the 3D information about the geology body which makes the research on transfer structure better. Based on up-to-date 3D seismic data, research is conducted on the 3D geometry and interconversion about KL1 and KL2 structure in Kuqa foreland thrust system. Results show that: (1) KL1 and KL2 are pop-up structures formed by two opposite inclination thrust faults and an anticline between them. (2) There are complex structures in this belt which perform as differential joint of the core and the limb of the anticline under the effection of transpression. (3) Quantitative analysis of fault activity shows that KL1 and KL2 have experienced initiative low anticline stage, pop-up structure stage, lateral growth stage and strike-slip transfer stage. (4) The preservation condition which is influenced by fault activities is different in KL1 and KL2. KL2 structure is rich in gas. The petroliferous property of KL1 structure is poor.