  In this paper, we study the possibility of building two-field models of dark
energy with equation of state across -1. Specifically we will consider two
classes of models: one consists of two scalar fields (Quintessence+Phantom) and
another includes one scalar (Phantom) and one spinor field (Neutrino). Our
studies indicate to some extent that two-field models give rise to a simple
realization of the dynamical dark energy model with the equation of state
across $w = -1$.
