The dilepton spectrum emitted in the phase transition process of an expanding quark gluon plasma formed in the collisions of 238U - 238U and l84W -l84W at 200 GeV/(cu) is calculated by using the theoretical framework of relativistic hydrodynamics, including the effect of quark flavor kinetics, and phenomenological SU (3) string model is used in the calculation of the quark flavor kinetics. The calculated results are compared with the experimental data from the Center of European Research of Nucleon SPS and analysis is carried out. The results show that the effects of quark fragmentation and flavor kinetics cause a peak suppression of J /ψ →μ^(+)μ^(-), while the dilepton spectrum increases for small invariant mass. The calculated results show that the phenomena of suppression under the rich-baryon condition is greater than those under the poor-baryon conditions. Under the same conditions of collision, the J / ψ peak suppression produced in 238U - 238U collisions is greater than that in l84W -l84W collisions.
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