To meet the requirements of bearing capacity and anti-liquefaction of liquefiable foundations, the reinforcement of liquefiable soil using CFG piles combined with gravel piles is used in engineering.In this study, a composite foundation with multi-type piles composed of gravel piles and CFG piles was analyzed.In composite foundations with multi-type piles, gravel piles are supplemented piles that are mainly used to accelerate the foundation drainage consolidation.CFG piles are the main piles that undertake greater seismic load and reduce the dynamic pore pressure and post-earthquake settlement of the foundation.A composite foundation with multi-type piles composed of gravel and CFG piles can improve the bearing capacity and liquefaction resistance of a liquefiable foundation.A three dimensional numerical model was established and the dynamic characteristics of a composite foundation with multi-type piles was studied through numerical simulation;the influence of design parameters such as the ratio of pile type, pile diameter, pile length, CFG pile body stiffness, and gravel pile body permeability on dynamic characteristics of a composite foundation with multi-type piles was analyzed.The results show that the dynamic deformation of a composite foundation, including gravel pile composite foundation, CFG pile composite foundation, and composite foundation with multi-type piles is obviously smaller than that of a natural foundation during earthquakes, and the dynamic deformation decreases with increase in the number of CFG piles.When the ratio of gravel piles and CFG piles is 4:5, the dynamic deformation curve of a composite foundation with multi-type piles is close to that of the CFG pile composite foundation and the influence of the increase in the amount of CFG piles on the reduction in the dynamic deformation of the composite foundation is no longer obvious.When the ratio of gravel piles and CFG piles is 4:5, the dynamic pore water pressure of the composite foundation with multi-type piles is relatively small compared to that of the CFG pile composite foundation, and the composite foundation settlement caused by the earthquake is also relatively low.In engineering design, an appropriate ratio of gravel piles to CFG piles is 4:5.The pile diameter, pile length, CFG pile body stiffness, and gravel pile body permeability can affect the dynamic deformation of a composite foundation with multi-type piles.With increase in the pile length, pile diameter, and CFG pile stiffness, the vertical dynamic deformation of the composite foundation with multi-type piles decreases gradually.With the increase of the permeability of the gravel pile body, the excess dynamic pore water pressure in the composite foundation with multi-type piles and the deformation after an earthquake decrease.