  System-environment interaction may introduce dynamic destruction of quantum
coherence, resulting in a special representation named as pointer states. Here,
pointer states of an open electronic system are studied. The decoherence effect
is taken into account through two different models which are B\"{u}ttiker's
virtual probe model and electron-phonon interaction in the polaron picture. The
pointer states of the system with different coupling strength are investigated.
The pointer states are identified by tracking the eigenstates of the density
matrix in real-time evolution. It is found that the pointer states can emerge
for arbitrary coupling strength. And the pointer states deform to the
eigenstates of the system in the strong coupling limit, which indicates the
vanish of quantumness in the strong coupling limit.
