  A disk-corona model for fitting low/hard (LH) state of associated steady jet
of black hole X-ray binaries (BHXBs) is proposed based on the large-scale
magnetic field configuration of the coexistence of the Blandford-Znajek (BZ)
and Blandford-Payne (BP) processes,where the magnetic field configuration for
the BP process is determined by the requirement of energy conversion from
Poynting energy flux into kinetic energy flux in the jet. It is found that
corona current is crucial to guarantee the consistency of the jet launching
from accretion disk. The relative importance of the BZ to BP processes in
powering jets from black hole accretion disk is discussed, and the LH state of
several BHXBs is fitted based on our model.In addition, we suggest that
magnetic field configuration could be regarded as the second parameter for
governing the state transition of BHXBs.
