We construct integrable models on flag manifold by using the symplecti
c structure explicitly given in the Bruhat coordinatization of flag ma
nifold. They are noncommutative integrable and some of the conserved q
uantities are given by the Casimir invariants. We quantize the systems
using the coherent state path-integral technique and find the exact e
xpression for the propagator for some special cases.