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By way of field performance test, the factors affecting the performance of the direct air-cooling system were studied.The results show that, there are certain problems on the Direct air-cooling system such as too large exhaust resistance, poor vacuum tight, condensate subcooling etc.Due to the influence of external environmental conditions and equipment and installation factors, there is a certain gap between the run performance and design performance of some units.Through further optimization test research, the steam turbine units with direct air-cooling system operate in the best economic way.To improve the performance of direct air-cooling system, it is necessary to take comprehensive implements by design parameter optimization, equipment installation and maintenance, operation optimization etc.