Abstract: The three-dimensional turbulent flow field at the exit of an axial single rotor compressor has been measured in detail with single-slant hot-wire probe.In the design condition,substantial turbulent pulsations mainly exist in the tip mid-passage,wake and the corner between the suction surface and the hub,and the tip leakage vortex plays a leading role in the tip flow mixing.In the near stall condition,the flow becomes more turbulent,which shows the strong flow mixing in the tip region,turbulence intensities,especially the radial turbulence intensity,increase rapidly;the flow separations of the boundary layer on the suction surface occur at 0.25 span and 0.87 span.At the rotor exit,the radial turbulence intensity is the largest,and the axial one is the second.