In this study, we supplement defects of existing PC construction methods in joining section. And we suggest new joining section details securing ability of execution and monolithic ability column-beam. To confirm monolithic ability in joining section in case of using strands in column-beam joining section of 6m column, we made 3 laboratory samples which have variables, the number of tension reinforcing rods and strands. Then we assessed some abilities, flexibility ability and structural ability, ductility ability under the repeated load.