Experimental and theoretical results of quantum transport in superconductor
-semiconductor junctions are summarized. We will first show the experimenta
l results of reentrant behavior of the conductance as well as of giant Andr
eev backscattering. Then Andresv reflection in the quantum Hall regime is d
escribed. The charging effect on the proximity correction is finally discus
sed. (C) 2001 Elsevier Science B.V. All rights reserved.