This paper which introduces the transaction concession strategy expands the artificial credit market model based on agent. First, through the investment and financing decision model, analysis the feasible set of the loan interest rate pricing in credit market. Second, proposed the bargaining decision mechanism of credit market based on concession strategy. Then we carried out simulation experiments on the artificial credit market based on concession strategy. The bilateral financial contract bargaining pricing mechanism under single issue frame in this paper provides fundamental ideas for optimizing the operation mechanism of credit market and improving credit market performance.