A new Tbit/s large capacity hybrid optical router switching system architecture was discribed, which employs high speed optical interconnection network to transmit informaUon, VCSEL/PIN as optoelectronic and electrooptical device, and high speed large scale integrate circuit to process the information· The proposed architecture uses high speed packet switching circuit chip, scalable switching fabric and shared buffer output queue scheme. The result shows that it is feasible to construct a router switching core with cell loss rate below 10^, port rate at 2.5 Gb/s and scalable 1024×1024 switching fabric.