Abstract: A server includes a mother board, a back board and a bridge board. A plurality of first connection lines and a first slot are disposed on the mother board. The first connection lines are employed for delivering a plurality of power signals and a plurality of control signals. A second slot is disposed on the back board. The bridge board has a first golden finger and a second golden finger, and a plurality of second connection lines are disposed on the bridge board and is electrically connected to the first golden finger and the second golden finger. The first golden finger and the second golden finger are respectively inserted into the first slot and the second slot. In this way, the control signals and the power signals from the mother board are delivered to the back board through the second connection lines on the bridge board.