Abstract: The disclosure relates to the technical field of air conditioning of vehicles, and in particular provides a vehicle and an air conditioning system thereof. The air conditioning system comprises: an air handling unit having a chamber, the air handling unit being capable of regulating the temperature of air entering the chamber; and an air duct group comprising an air supply duct in communication with an in-cabin space of the vehicle, the air supply duct comprising at least a back-row air duct that releases air to a back-row space in the in-cabin space. The air conditioning system further comprises a bypass air duct, at least part of which does not have an intersecting portion with the air handling unit so as to reduce, at least in part, the resistance due to air having to flow through the air handling unit on the premise of allowing the air to enter the back-row space via the bypass air duct.