Abstract: Based on the model testof a super-large pile group undervertical load, the characteristic of load transfer, the bearing behavior, and the lawof variation in side resistance of the pile group are analyzed. It is shown thatunderthe experimental conditions the middle piles are subjected tothe maximumvertical load, and the axial force in the lower partof a pile is largerthan that in the upper part. With the load increasing, the side resistance of a pile comes into play first in the lower part of the pile, and increases progressively from the lower part to the upper part.