Abstract: An air discharge system of an HVAC (Heat, Ventilation, and Air Conditioning) system for a vehicle, may include a first path provided in the HVAC system to communicate with discharge ports of a front seat, the first path allowing air that has passed through a heat exchanger to be discharged through the discharge ports of the front seat, a second path diverged from the first path to communicate with discharge ports of a rear seat, the second path allowing air that has passed through the heat exchanger to be discharged through the discharge ports of the rear seat, thus enabling the independent discharge of air to the rear seat, and a first control door provided at a position where the first path and the second path diverge from each other, thus opening or closing the second path.