During the transition season periods the technology of tower cooling is used to cool the internal heat source region in the buildings, which is energy saving and environment friendly technology. To aim at climatic conditions of the transition season in Harbin, The air conditioning experimental study is done through the technology of tower coolingdirectly¡£The annual service hours of tower cooling is attained, the influence factors of tower cooling and energy-saving effectiveness is analyzed. With the result from experiment, when wet bulb temperature 10 ¡æ outdoor is as diversion temperature, energy saving rate of the system can reach 14.8%.