Abstract: Most studies on transaction decision-support, are focus on the static analysis to customer information, but ignoring that the customer activity are the reaction to the business information he receive. The paper considers the dynamic intelligent action of business and customer during the information transmitting and put forward the idea of design of business platform of signaling game facing to transaction decision-support. By applying signaling game theory to analyze the information transmitting between business and customer, and combining the idea of multi-agent and self-adaptive, the platform may discover the real type of customer behind his information sent, and offer the strategy to the business aiming at the different customer activities. The design of the platform is composed of three steps: the composition of platform, the establishment of arithmetic and the foundation of platform.