This paper focuses on the aspect that the tube set connection types are found to have an effect on the heat transfer performance in the air-cooled condensers through a series of type tests. The experimental results show that the three-row air-cooled condenser with "2 way to 1 way" connection type is an ideal type. Under the sam conditions the heat transfer coefficient of the air-cooled condenser with this tube set connection type is 100% higher than that of the air-cooled condenser with the 3 paralle-way tube set connection type.