Dc Cross Flow Fan impeller flow velocity at various points in the outer circumference of the impeller is inconsistent, the closer to the vortex center, the speed is greater, the closer to the vortex housing, the speed is low. The airflow velocity and pressure at the outlet of the Dc Cross-Flow Fan are not uniform, so the flow coefficient and pressure coefficient of the Dc Cross flow Fan are average values. The vortex location has a great influence on the performance of the cross-flow Blower. The vortex center is close to the inner circumference of the impeller and close to the cochlear tongue. The performance of Dc Cross Flow Blower is good. If the vortex center is far away from the vortex tongue, the area of circulating flow increases, the Dc Axial Fans efficiency decreases, and the degree of flow instability increases.