"Brushless Cooling Fan" because of its theoretically unlimited width, as well as air volume, dimensions, etc, cleaning materials in agriculture and other sectors has been widely used. "Brushless Cooling Fan" Although there are many scholars have studied, but there are still some fundamental issues to be further explored. For example: On what basis do twice the gas flowing through the Cascades, the impeller to control how the vortex flow field formed, depending on what the gas flow direction (that is, how the air inlet and outlet determine) and so on. To this end, were studied. To facilitate "Brushless Cooling Fan" flow field observation, photography and static pressure measurements, tests with water simulation.