The ownership of the projects has transferred from the contractors to the originators in the repurchase period of the BT mode.In order to guarantee the success of transfer of the projects, it is extraordinarily important for the originators to control the risk of repurchase with effect.Taking mechanism as the cut-point, from the analytical perspective of the originators, this paper recognizes and analyzes the risks that may appear in the period of repurchase in BT projects, and structure a new risk management mechanism that suit the originator by reforming the process of risk management, the organization of management and the structure of mechanism.