<p>The cooling system of dual-stator permanent magnet wind power generator (DSPMWPG) is studied in this paper to solve the problem of heat dissipation caused by complex structure and high loss density of electric machine. At first, a new 500&#xa0;kW DSPMWPG is designed, and the loss and electromotive force of the DSPMWPG is calculated and analyzed. Secondly, according to the theory of electric machine with fluid dynamics and heat transfer, combined with the structure of the electric machine, the fluid-structure coupling model of the DSPMWPG is established. Based on the loss and the fluid-structure coupling model of the electric machine, this paper proposes the finite volume method of computational fluid dynamics (CFD) to calculate and analyze the temperature field of the DSPMWPG. On this basis, the air cooling stucture, which is a radial forced ventilation structure with air inlet through one side of the stationary shaft, is designed to solve the heat dissipation problem of the DSPMWPG. Then, the temperature field of the DSPMWPG with new air cooling structure is calculated and analyzed to adopt the finite volume method of CFD. From the results, the maximum temperature of outer and inner windings in the electric machine is 24.93 ℃, 49.38 ℃ lower than that of the DSPMWPG original structure, respectively. Finally, the air cooling structure is optimized and considered influence of structural parameter on the temperature rise and the static pressure of the electric machine. On this basis, the wind shield is set up to further optimize the airflow path and reduce wind vortices, which provides useful reference for the research on the cooling of electric machine with dual-stator structure.</p>