  We review the recent multifrequency studies of galactic black hole binaries,
aiming at revealing the underlying emission processes and physical properties
in these systems. The optical and infrared observations are important for
determining their system parameters, such as the companion star type, orbital
period and separation, inclination angle and the black hole mass. The radio
observations are useful for studying high energy electron acceleration process,
jet formation and transport. X-ray observations can be used to probe the inner
accretion disk region in order to understand the fundamental physics of the
accretion disk in the strongest gravitational field and the properties of the
black hole. Future higher sensitivity and better resolution instrumentation
will be needed to answer the many fundamental questions that have arisen.
