  We study the baryon-quark phase transition in a molecular dynamics (MD) of
quark degrees of freedom at finite temperature and density. The baryon state at
low density and temperature, and the deconfined quark state at high density and
temperature are reproduced. We investigate the equations of state of matters
with different $u$-$d$-$s$ compositions. Then we draw phase diagrams in the
temperature-density plane by this simulation. It is found that the baryon-quark
transition is sensitive to the quark width.
