The influence of time step, grid size, rain intensity threshold and other parameter changes in TREC method on tracking results is discussed, and the TREC vector field is smoothed, which to a certain extent reduces some obviously wrong vectors caused by ground object echoes and echo gradient changes in the TREC vector field, obtains a more continuous vector field, and uses the vector field obtained to predict the approaching rainstorm. The radar echo characteristics of mesoscale systems in the rainstorm process, such as low-level jet, warm advection, warm shear, cold shear, and headwind area, are analyzed; Through their identification and comparison with precipitation characteristics and rainstorm falling areas, it is shown that these mesoscale systems have clear indication significance in the near forecast of rainstorm.