  We present results from analysis of the X-ray archive data of MCG-2-58-22,
acquired with ROSAT from 1991 to 1993 and with ASCA from 1993 to 1997. By
analyzing light curves, we find that MCG-2-58-22 shows a clear time variability
in X-ray flux. The time scales of the variations range widely from about 1000 s
to more than years. Among the variations, a flare-like event overlaid on the
gradual flux decrease from 1979 to 1993 is detected. We also find clear time
variability of the spectra in the energy range of 0.1 - 2.0 keV. However, the
flux variation does not influences on their spectra in the energy range of 2 -
10 keV. The implications of these observational results are discussed in terms
of a supermassive black hole model and accretion flow dynamics near the central
black hole.
