A briefing system, a wearable device, and a note presentation method for briefing are provided. The briefing system includes a control unit, a projection unit and a wearable device. The projection unit is adapted to connect to the control unit in a wired/wireless manner and display a briefing content. The wearable device is adapted to communicate with the control unit via a protocol. The wearable device has a display screen. The control unit transmits a note content corresponding to the briefing content to the wearable device via the protocol. The wearable device displays the received note content on the display screen of the wearable device.
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