Abstract: Based on the load distribution on the raft of high-rise buildings,different pile arrangement was adopted that more piles were used in the center than on the edge or piles were only arranged in the center area.Through model tests(1:10),the static load tests on unpiled raft and rigid composite foundation with super structure were carried out.The raft settlements,subgrade settlements under pile bottom plane,settlements of ground beside raft,distribution of reaction force from soil and pile top,load transfer and load share ratio between piles and soil were analyzed.The effect of different arrangements of piles to reduce differential settlements of raft was studied under working loads.