The heat transfer efficiency of air-cooled heat pump system would decrease in high outdoor temperature. Evaporative condenser gradually get wide attention due to its contribution to solve the problem. In order to study the energy consumption of heat pump with evaporative condenser, it was made a comparative study about compressor power consumption of evaporative condenser and air cooling condenser under the same conditions by orthogonal experiment and analyzed factors of efficiency. The results show that the influence of factors on power consumption and energy efficiency of compressor are as follows:inlet air temperature of condenser water volume, air velocity. Compressor power consumption increases with the increase of inlet air temperature and the decrease of air velocity. The compressor energy consumption decreases at first and then is constant with the increase of water volume.