  Warm Absorbers (WAs), as an important form of AGN outflows, show absorption
in both UV and X-ray band. Using XSTAR generated photoionization models, for
the first time we present a joint fit to the simultaneous observations of
HST/COS and Chandra/HETGS on NGC 3783. A total of five WAs explain well all
absorption features from the AGN outflows, which are spread over a wide range
of parameters: ionization parameter log{\xi} from 0.6 to 3.8, column density
log N_H from 19.5 to 22.3 cm^{-2}, velocity v from 380 to 1060 km s^{-1}, and
covering factor from 0.33 to 0.75. Not all the five WAs are consistent in
pressure. Two of them are likely different parts of the same absorbing gas, and
two of the other WAs may be smaller discrete clouds that are blown out from the
inner region of the torus at different periods. The five WAs suggest a total
mass outflowing rate within the range of 0.22-4.1 solar mass per year.
