Abstract: The recent development of studies on Reynolds number (Re) on turbulence is reviewed.It is found that, except for the distributions of radial skewness and flatness factors, there exists aRe-dependence region. For different physical paraxneters, this region is different, and different resultsare obtained even for a same physical parameter. This means that the flow is complex in the nearwall region and it is difficult to measure precisely. Owing to the high precision, no disturbance tothe flow, fine spatial re...