In order to study the collapse performance of beam-column structure with key-way joints and to study the effect of different post-cast concrete on its performance，static loading tests for two single-story two-span beam-column structures were performed. In the two specimens，ordinary C30 concrete and high ductility ECC concrete were poured at the key-way joints，respectively. The test dates of force displacement curve，failure mode and deformation performance were obtained. The research indicated that the beam-column structure with key-way joints developed beam mechanism，arch mechanism and catenary mechanism in turn during the deformation process under the requirements of the conventional seismic load. It was a good anti-collapse node form for the assembled structure. Relying on the superior material properties of ECC，such as high ductility and high ultimate compressive strain，beam-column structure with ECC key-way joints can exhibit greater load-carrying capacity and better ductility of joints. The local non-uniform relative slip between steel and concrete was conducive to the development of large deformation of the structure and improved the collapse resistance of the structure.