Abstract: The analysis of the evolution of the turbulent coherent structure is an important tool in the investigation of the trench drag reduction mechanism. In order to make clear the adaptability of the Liutex parameter and the Omega criterion in the study of trench drag reduction mechanism, numerical simulations were carried out for a trench basin with a transverse trench structure using a large eddy simulation method, and the similarities and differences between the Liutex parameter and the Omega criterion and the traditional identification method were compared. A comprehensive comparison between this method and the traditional vortex identification methods reveals that: the Omega criterion is more convenient for threshold selection with low sensitivity and strong robustness, while for small vortex structures near the wall, it has no outstanding advantages compared with the traditional identification methods. The Liutex line is more accurate and regular compared with the vortex volume line, and it fits better with the vortex structure. The Omega criterion and the Liutex parameter are both well adapted in the analysis of the transverse trench. The Omega criterion and the Liutex parameters are both very suitable for the analysis of the drag reduction mechanism in the lateral groove structural basin, which is of great significance in the study of the drag reduction mechanism in the trench.