  The aim of this paper is to study the variability of the warm absorber
"clouds of ionised gas within AGN", for the Seyfert 1 galaxies Arakelian 564.
The X-ray spectra for four XMM-Newton observations of this object are analysed
in EPIC and RGS instruments. These four observations covered a period of eleven
years. There are some changes in the ionisation parameter ($ \xi $) of the
absorbing matter from one observation to another( $\log\xi =0.889 \pm 3.11
\times 10^{-2}$ for year 2000 observation and $0.437 \pm 7.60 \times 10^{-2}$
for year 2001 ). Also the X-ray soft excess is studied for the four observation
by using two blackbody parameters in EPIC spectra ( the first black-body
temperature is $\sim $ $0.129 \pm 2.04 \times 10^{-3}$ Kev and the second is
$\sim 1.74 \pm 7.6 \times {10^{-2}}$ Kev) and one black body parameter in RGS
spectra.
