A high efficiency vented dryer having a heat pump system, comprising: an outer drum, an air-intake drying air duct and an air-exhaust drying air duct for allowing the outer drum communicating with the outside respectively; and a heat pump system comprising a first evaporator and a second evaporator, the second evaporator being arranged in an external atmosphere so as to absorb heat from the external air; characterized in that the first evaporator is arranged in the air-exhaust drying air duct so as to absorb heat from the exhaust air, and wherein: a) the first evaporator and the second evaporator are arranged in parallel, wherein an air-intake end of the first evaporator and an air-intake end of the second evaporator are respectively communicated with an air-out end of a throttling device of the heat pump system, and an air-out end of the first evaporator and an air-out end of the second evaporator are respectively communicated with an air-intake end of a compressor of the heat pump system; or b) the first evaporator and the second evaporator are arranged in series, wherein the air-out end of the first evaporator is communicated with the air-intake end of the second evaporator, and the air-out end of the second evaporator is communicated with the air-intake end of the compressor of the heat pump system. an outer drum, an air-intake drying air duct and an air-exhaust drying air duct for allowing the outer drum communicating with the outside respectively; and a heat pump system comprising a first evaporator and a second evaporator, the second evaporator being arranged in an external atmosphere so as to absorb heat from the external air; characterized in that the first evaporator is arranged in the air-exhaust drying air duct so as to absorb heat from the exhaust air, and wherein: a) the first evaporator and the second evaporator are arranged in parallel, wherein an air-intake end of the first evaporator and an air-intake end of the second evaporator are respectively communicated with an air-out end of a throttling device of the heat pump system, and an air-out end of the first evaporator and an air-out end of the second evaporator are respectively communicated with an air-intake end of a compressor of the heat pump system; or b) the first evaporator and the second evaporator are arranged in series, wherein the air-out end of the first evaporator is communicated with the air-intake end of the second evaporator, and the air-out end of the second evaporator is communicated with the air-intake end of the compressor of the heat pump system. a) the first evaporator and the second evaporator are arranged in parallel, wherein an air-intake end of the first evaporator and an air-intake end of the second evaporator are respectively communicated with an air-out end of a throttling device of the heat pump system, and an air-out end of the first evaporator and an air-out end of the second evaporator are respectively communicated with an air-intake end of a compressor of the heat pump system; or b) the first evaporator and the second evaporator are arranged in series, wherein the air-out end of the first evaporator is communicated with the air-intake end of the second evaporator, and the air-out end of the second evaporator is communicated with the air-intake end of the compressor of the heat pump system.