In order to study the effect of outlet-water temperature on the refrigeration performance of modular air-cooled chilled (hot)water with electronic expansion value and modularity energy adjustment system，experiments were carried out with 5 units with 60 kW refrigerating output under different working conditions：outlet water temperature of evaporator chilled water in the range of 5—12℃，ambient dry-bulb temperature in the range of 25—42℃，and relative humidity 40%.The cooling capacity of the unit is 54—71 kW，power consumption is 17.2—22.2 kW，and refrigeration COP is 2.55—3.84.The effect of outlet-water temperature of chilled water on refrigeration capacity，input power and COP were examined，which provides the basis for energy saving operation and optimization design.