A new air source solar-coupled heat pump unit hanging on balcony is designed in this paper. The technical characteristics are analyzed and the operatation modes are introduced. The solar-coupled heat pump unit makes full use of solar energy. It can not only provide living hot water but also increase the performance of air source heat pump in winter. In addition, the unit can effectively improve the stability of solar water heater in overcast sky and rainy days. The simulation model of the heat pump unit has been established and the simulation software has also been designed. The simulation studies on heating and cooling of the heat pump system have been conducted. The results indicate that the performances of air source solar-coupled heat pump are better than that of air source heat pump without assistant solar energy in winter. The experimental researches are conducted to verify the simulation results.