  A magnetic model for low/hard state (LHS) of black hole X-ray binaries
(BHXBs),H1743-322 and GX 339-4, is proposed based on the transportation of
magnetic field from a companion into an accretion disk around a black hole
(BH). This model consists of a truncated thin disk with an inner
advection-dominated accretion flow (ADAF). The spectral profiles of the sources
are fitted in agreement with the data observed at four different dates
corresponding to the rising phase of the LHS. In addition, the association of
the LHS with quasi-steady jet is modelled based on transportation of magnetic
field, where the Blandford-Znajek (BZ) and Blandford-Payne (BP) processes are
invoked to drive the jets from BH and inner ADAF. It turns out that the steep
radio/X-ray correlations observed in H1743-322 and GX 339-4 can be interpreted
based on our model.
