  The large scale magnetic fields of our Galaxy have been mostly revealed by
rotation measures ($RM$s) of pulsars and extragalactic radio sources. In the
disk of our Galaxy, the average field strength over a few kpc scale is about
1.8 $\mu$G, while the total field, including the random fields on smaller
scales, has a strength of about 5 $\mu$G. The local regular field, if it is
part of the large scale field of a bisymmetric form, has a pitch angle of about
$-8\degr$. There are at least three, and perhaps five, field reversals from the
Norma arm to the outer skirt of our Galaxy.
