Abstract: Based on the Fluent software, we used the standard k-ε model to close the Reynolds average equations and analyze the flow field in the three-dimensional of the air cooled condenser system (ACC) for the specific project.We calculated the fields of air velocity and temperature and established the relevant equations and theory models. Combined with the actual situation of the project, we deeply analyze the flow field of the ACC: 1)Installation of windshield board in high-temperature and specially wind environment improve the most effective measures to the thermal performance for the ACC. 2) Increase the number of windshield board to improve the thermal performance for the ACC, four or more windshield board to improve the heat dissipation rate of increase is very small, and we suggest that they're installed in the lower portion of the fan draft tube. 3) Although the windshield board have obviously effect, and it can greatly change the fan inlet into the wind conditions, fans need to run safely and operate effectively.