  Inclusive semileptonic decays are discussed in the framework of heavy quark
effective field theory by employing the short distance expansion in the
effective theory. The lowest order term turns out to be the parton model; the
higher order terms may be regarded as correction terms to the parton model
result. The first nonvanishing corrections to the parton model result are given
and the lepton energy spectrum of inclusive semileptonic decays of heavy mesons
is calculated.
