5.90和3.56。The Exergy analytical method was adopted to analyze the performance of groundwater source heat pump (GSHP) system by applying Exergy destruction Edest and Exergy efficiency ε. Related Exergy analytical models have been put forward according to the cooling experiment carried out in an office building and a Chinese solar greenhouse in the summertime of 2007. Analytical results showed that the evaporator has a higher Exergy efficiency than other parts of the system, which reached 95%. However, the Exergy efficiency of condenser and total GSHP system was not very satisfying. Meanwhile, the coefficient of performance of GSHP unit and total system has reached 5.90 and 3.56 respectively. 