Abstract: Four groups of centrifugal model tests are performed to investigate the failure mechanisms of embankment on inclined soft foundation reinforced by CFG piles. The tests simulate four kinds of grounds: natural inclined soft ground, normal CFG composite ground, inclined CFG composite ground, and inclined defect CFG composite ground. The results show that the failure mechanisms are as follows: (1) CFG piles are prone to fracture into many rigid short piles moving with soil failure; (2) For the inclined ground, fractures of CFG piles occur more greatly along the downhill direction, and the deformation is larger; (3) For the defect CFG pile composite ground, the deformation is significantly larger.