Abstract: Firstly, the field test data are compared with ABAQUS numerical simulation data to verify mesh size, grid type and other parameters. Then, we establish the group PHC pile (prestressed high-strength concrete spun piles) model with different geometric parameters and calculate it. The results show that the efficiency of pile groups is obvious within a certain pile spacing, and that with the pile distance become farer, the carrying capacity of pile group become bigger, but that the increase trends become smaller. Finally, when pile spacing exceeds the critical value, the behavior of pile groups become weak. The carrying capacity of pile groups in different pile length is also nonlinear increased with the pile length, and it closes to a given value at the end.