<p>Particle breakage and morphology evolution significantly impact the mechanical properties of soils. However, the morphology evolution patterns of each fraction within the total grading remain unclear due to the difficulty of particle tracing. This study involved conducting a series of one-dimensional compression tests on stained coral sands, examining both well-graded and poorly graded samples. Results indicated that for well-graded coral sands, large particles exhibited a lower survival rate and transformed into rounder and more regular shape after compression, whereas the morphology of finer particles rarely changed. Within a specific fraction of the total grading, the survival particles of the same size tended to be rounder and more regular, while the newly created finer fragments would be sharper. Besides, the average values of circularity and solidity for a given grading in well-graded samples were higher than those in poorly graded conditions. To investigate the influence of initial particle shape and mineral composition on morphology evolution, additional compression tests were conducted on shell sands and completely decomposed granite (CDG) sands. The results indicate that mineral composition, rather than initial particle shape, significantly affects particle morphology evolution. After compression, all CDG sand particles became less round and more irregular, demonstrating a contrasting morphology evolution compared to that observed in calcareous sands.</p>