Solar photovoltaic-thermal (PV/T) technology is one of the main utilization of solar energy, the dual benefits of the system generation and heat are realized by solar PV/T system. Based on the climate characteristics of different climate zones, the condensed water coupling photovoltaic/photothermal system of shopping mall was taken as the research object. On the premise of determining the condensing water in the cooling season, the primary energy-saving rate and environmental benefit of the system were calculated and analyzed, and the suitability of the system in different climate zones was studied. The results show that PV/T system is more energy efficient than PV system in cold region, hot summer and cold winter region and hot summer and warm winter region. Throughout the cooling season, the PV/T system produce more electricity than the PV system, and the power generation efficiency in Haikou is increased by 0.53%, and that in Lhasa is increased by 0.11%. The primary energy-saving rate of 59.62% is the highest in Haikou, and the highest CO₂ emission reduction of 5.5 t is observed in Qingdao.