  We conducted the first multi-frequency polarimetric imaging of four broad
absorption line (BAL) quasars using Very Long Baseline Array at milli-arcsecond
resolutions to investigate the inclination of the non-thermal jet and test the
hypothesis that radio sources in BAL quasars are still young. Among these four
sources, J0928+446, J1018+0530, and J1405+4056 show one-sided structures in
parsec scales, and polarized emission detected in the core. These
characteristics are consistent with those of blazars. We set constraints on
viewing angles to $<$66 deg for these jets, in the framework of a Doppler
beaming effect. J1159+0112 exhibits an unpolarized gigahertz peaked spectrum
component and several discrete blobs with steep spectra on both sides of the
central component across $\sim$1 kpc. These properties are consistent with
those of young radio sources. We discuss the structures of jets and AGN wind.
