The driving process of prefabricated piles of a wharf in coastal areas is monitored.The result shows that due to the soil’s severe disturbance around the pile,the penetration resistance of pile is greatly reduced,and that of silty soil is higher than that of silty sand.The redriving test shows that the coefficient of restitution of silty soil is larger than that of silt,and kin friction along the pile is closely related to the pile side soil properties.Appropriate piling hammer shall be chosen according to the soil condition during pile-driving to reduce or avoid the adverse effects on the pile.