A large air-cooled turbine generator rotor adopts the cooling mode of wind inlet from both sides of the wire. In order to study the influences of the number of conductors in the slots, the conductor flow areas and the radial and circumferential locations of conductors on the distribution in the hollow conductor mass flow, inletoutlet temperature difference and the average temperature, 1/2 circle and half rotor model is established, including end winding, winding active part, airgap and the fluid domain. According to the principle of computational fluid dynamics, the finite volume method is used to simulate the threedimensional heat flow field in the computational domain. The results show that the conductor located in circumference R12 and winding L1 has the maximum flow rate of 0.0189 m3/s, while the conductor at circumference R2 and winding T5 has the dangerous part with the highest temperature reaching 129.10 ℃, which is still within the rotor normal temperature range. Through the variance analysis, it is found that radial and circumferential position distribution has similar effects on the conductor average temperature heterogeneity, and the influence of the conductor flow area is greater.