  We present results of star variability analysis in OGLE II first bulge field.
Photometric database was derived by means of image subtraction method (Wozniak
2000) and contains 4597 objects pre-classified as variables. We analyzed all
the light curves in order to find periodic variables, non periodic but all-time
variables and stars showing episodic changes in their brightness, e.g.
gravitational lenses. Variability of 3969 stars was confirmed, among them we
detected 12 lensing event candidates whose light curves are shown. We found 762
periodic variables. Algorithmic methods let us identify 71 RR Lyrae and 110 W
UMa stars. Almost all luminous red giants are found to be variable. Most of red
clump giants are not variable. Classification of all 4597 objects is presented
online.
