  The QCD analysis of deep inelastic diffractive scattering is performed
assuming the dominance of the "soft" pomeron exchange and simple, physically
motivated parametrization of parton distributions in a pomeron. Results of the
analysis are compared with the recent data obtained by the H1 collaboration at
HERA. Both the LO and NLO approximations are considered and the theoretical
predictions concerning the quantity $R=F_L^D/F_T^D$ for diffractive structure
functions are presented.
