A new type of structure, column-steel reinforced concrete and beam-steel, is came to be constructed now. The feature of this type of structure is the panel zone as the joint of framework of two different kinds of structure. This study was carried out to investigate the mechanical characteristic of this kind of column-beam connections, and in this paper to discuss the ultimate strength of panel, the experimental results are compared with the calculated results by the equations of A. I. J. and by the proposed model.