In this paper we discuss the relation between representations of Lie g
roups and geometric quantizations. A series of representations of Lie
groups are constructed by geometric quantization of coadjoint orbits.
Particularly, all representations of compact Lie groups, holomorphic d
iscrete series of representations and spherical representations of red
uctive Lie groups are constructed by geometric quantizations of ellipt
ic and hyperbolic coadjoint orbits.