  We present a uniform analysis of the ROSAT HRI and the ASCA GIS/SIS data for
79 distant clusters of galaxies in the redshift range, 0.1 < z < 0.82 to study
the global structures of the intracluster medium. We have constructed an X-ray
catalog consisting of the largest sample of clusters in the redshift range for
which pointed X-ray observations were carried out with both the observatories.
We determined the emission-weighted X-ray temperatures of the clusters with
ASCA, while we studied surface brightness distribution with the ROSAT HRI
utilizing the isothermal beta model. We investigated the statistical properties
and trends for redshift evolution of the X-ray parameters including the
temperature, the density profile of the intracluster gas and the gas-mass
fraction within r500. We also present correlations of the cluster parameters
with the X-ray temperature and with the core radius and compare them with the
predictions of the self-similar model, from which we discuss the possible
origin of the double structure discovered in the core radius distribution.
