Abstract: In KDKZ3 block of Tarim basin,the main target strata of Ordovician have complex structure, developed fractures and caves,while the seismic data have low signal-to-noise ratio and there exists much difficulty in imaging. In order to improve the imaging accuracy of seismic data,through the application of micro-logging constrained tomography static correction technology,processing technology based on lowfrequency effective signal protection,high-precision depth domain velocity modeling technology for fine imaging of Ordovician carbonate rocks,reverse-time migration and other technologies, the imaging accuracy of complex geological structures inside the Ordovician was improved,and the reflection characteristics of various traps in middle and lower Ordovician-upper Cambrian carbonate rocks were highlighted,which therefore provides reliable seismic data for the further implementation of the distribution of fracture-cave Ordovician reservoirs in Paleozoic.