  A theoretical study is presented to quantitatively analyze the transport
experiment through individual DNA molecules reported recently by Porath {\it et
al.} [Nature {\bf 403}, 635 (2000)]. A variety of valuable quantities are
identified by contacting the theoretical model with the measured data. The
partially decoherent nature on the GC pairs of DNA is elaborated in contrast to
the completely incoherent hopping mechanism discussed in the context of charge
transfer experiments.
