  We numerically analyze recent high energy heavy-ion collision experiments
based on a hydrodynamical model with phase transition and discuss a systematic
change of initial state of QGP-fluid depending on colliding-nuclei's mass. In a
previous paper, we formulated a (3+1)-dimensional hydrodynamical model for
quark-gluon plasma with phase transition and discussed numerically the
space-time evolution in detail. We here compare the numerical solution with the
hadronic distributions given by CERN WA80 and NA35. Systematic analyses of the
experiments with various colliding nuclei enable us to discuss the dependences
of the initial parameters of the hydrodynamical model on colliding nuclei's
mass. Furthermore, extrapolating the present experiments, we derive the
possible hadronic distributions for lead-lead 150GeV/A collision.
