  The role of the QCD vacuum effects in high energy diffractive quark-quark and
quark-antiquark scattering is studied with the Instanton Liquid Model. The
special attention is given to the problem of formation of the soft Pomeron. We
show that in the leading approximation in instanton density the $C-$odd
instanton contribution to the diffractive amplitude is suppressed as $1/s$
compared to the $C-$even one.
