Abstract：In composite foundation，pile-soil stress ratio is an important design parameter. By measuring different types of rigid pile composite foundations under the static plate test and prototype test in different regions in Guangdong Province，changes of pile-soil stress ratio were obtained. It shows that there is a compact relationship between pile-soil stress ratio and the relative stiffness of pile-soil. For rigid piles with different stiffnesses under the same cushion，the load shared by rigid pile in composite foundation will change from 50 percent to 85 percent of total load. The achieved results can provide references to future rigid composite foundation design.
