Most of existing studies for B2B are concerned with efficient search and/or negotiation. But nevertheless it is important to provide quick and transparent guarantee to the buyer, it is hard to find studies related with it. This article suggests the guarantee process for customer satisfaction after purchasing in B2B e-marketplace under make-to-order manufacturing environment. The process consists of three modules; a request and response, a feedback processing, and a work inquiry. Each of them is adopted according to the source of defect and business relationship of buyer, seller, provider, and repairer. All of the process is implemented in user-friendly fashion and a case is presented for the enterprise portal site.