Abstract: In order to further explore the settlement regularity of rigid composite pile composite foundation.Experiment on 12 groups of rigid combined-pile composite foundations are studied based on the designed model test loading system and experimental box.Settlement standard are embedded in the longshort piles combined reinforced area,the interface between short pile and subsoil,long pile reinforced area and the interface between pong pile and substratum.The settlement law of long-short pile combined composite foundation with different pile-length,pile-diameter and pile-spacing of is measured at different depths.In addition,the settlement characteristics of different influencing factors at the same depth and different depths for the same factors are analyzed in the long-short piles combined reinforced area,the interface between short pile and subsoil,long pile reinforced area and the interface between pong pile and substratum.It can be concluded that,the main control effect of the square pile length is remarkable.Effect of pile length,pile diameter and pile spacing on the settlement is more obvious in the long-short piles combined reinforced area.However,there are no significant differences in the influence of parameters above mentioned on the settlement of long pile reinforced area.