The first edition of ebXML which aims at unimarket was announced at May 1 of 2001. OASIS continues working on the framework of ebXML, and UN/CEFACT does on the contents. In our country, 30 vertical B2B markets are being constructed and most of them adopted ebXML as their main standard. In this situation, we need to make a guideline which can interconnect individual vertical B2B systems. In our study, we propose an architecture for i) Central Registry/Repository for the interconnection of between vertical B2Bs, between ebXML and non-ebXML, and between nations. ii) Information modeling for interconnection. iii) Distributed modeling. We hope our work could be extended by following discussion of academical and industrial researchers.