The connection system of steel pile and RC footing is an important structure because the total load of upper construction should be transferred through the joint construction of different two materials-steel and RC-with strongly changed section area. Although many connection systems have been developed, their structural and economical efficiency and workability are often insufficient. Therefore, a new connecting system was developed to improve the above mentioned problems of current systems. The divided arc plate could improve the workability and economical efficiency, structural efficiency could be reached by welding. The main purpose of the research is to evaluate the structural behavior of the new designed connection system through experiments.