  Treating the bilocal quark-quark interaction kernel as an input parameter,
the self-energy functions can be determined from the ``rainbow''
Dyson-Schwinger equation, which is obtained in the global color symmetry model.
The tensor susceptibility of QCD vacuum can be calculated directly from these
self-energy functions. The values we obtained are much smaller than the
estimations from QCD sum rules and from chiral constituent quark model.
