  The Coulomb screening effect and the finite-size effect such as surface
tension are figured out in the hadron-quark deconfinement phase transition. We
study the mixed phase of the quark droplets immersed in hadron matter. We see
that the droplet phase is mechanically unstable if the surface tension is
strong enough. Once the Coulomb potential is properly taken into account, we
could effectively satisfy the condition for charge chemical equilibrium in the
Maxwell construction. As a result, we suggest the Maxwell construction revives
the physical meaning effectively.
