Surface water source heat pump system: If there are surface waters such as rivers, lakes and seas near the building, the closed-loop heat exchange coils can be placed into the water as the outdoor system of ground source heat pump. In summer, the cooling water that has been absorbed from the heat pump condenser enters the lake or the sea through a sealed piping system, and utilizes the stable temperature of the lake or seawater to dissipate heat. In winter, the heat of the lake or seawater is absorbed and transferred to the evaporator of the heat pump unit. Not only could this method eliminate water pollution, but it also efficiently reduce the construction cost of the outdoor heat exchange system.