Research conclusions：In this paper, it is proposed the BT undertaker substitutes for the owner to manage the supervision unit for further bringing into the better balance relations among the BT undertaker, owner and supervision unit, solving the problem of supervisions' deficiency and giving full play to the supervision. It is also proposed that the check-up system to the supervision unit by the BT undertaker, the communication system between the BT undertaker and supervision unit, the regular meeting system between BT undertaker and supervision unit, special examination system and inspiring system should be setup for improving the management system for supervision, giving full play to the supervision and enhancing the construction level of BT project.