Wether the parameters of CFG pile composite foundation in strengthening soft foundation of highway are reasonable or not is determined by it’s actual bearing capacity and deforming characteristics under loads.Based on the in-situ earth pressure and surface settlement tests of the CFG pile composite foundation

this paper investigates the variations of the stress and settlement on the top of the pile and soil under the embankment load

and then analysizes the reasonableness of parameters such as the cushion thickness

the distance of piles and the strength of pile.The experiment results show that CFG piles and soils can eventually deform consistently

the pile-soil ratio is closely related to the balance of settlements of pile and soil

and the soils between piles bear the most loadings in the case of sparsely distributed piles.When the CFG pile composite foundation is subjected to the embankment load

large distance of piles could be chosen

the strength of pile may be reduced and the cushion thickness should be designed to larger accordingly.