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Through-flow effects on turbulent heat transfer in the Taylor-Couette-Poiseuille flow were investigated by using a large eddy simulation. Through-flow Reynolds numbers of 1000 and 4000 under a constant inner-wall rotation speed were examined. Increase of the through-flow Reynolds number caused increase and decrease of the Nusselt numbers at inner and outer walls, respectively. At lower through-flow Reynolds number, the Taylor vortices were observed. On the other hand, at higher through-flow Reynolds number, the Taylor vortices were transformed into streak and spiral-band structures near the inner and outer walls, respectively. These flow structures were clearly visualized by contour surfaces of instantaneous temperature and second invariant of deformation tensor.Copyright © 2015 by JSME