Composition analysis of as-deposited yttrium doped barium zirconate (BZY) films was conducted using X-ray photoelectron spectroscopy (XPS). The BZY films were prepared by pulsed laser deposition (PLD) with variations of target-to-substrate distance (T-S Dis.) and ambient oxygen pressure (PO<SUB>2,amb</SUB>). As a result, barium loss in the PLD was observed from all of the deposited BZY films even though a stoichiometric PLD BZY target was used. It is confirmed that the barium deficiency decreased with increasing the PO<SUB>2,amb..</SUB> The T-S Dis. effect on the barium deficiency was not discernible in the targeted range but the relation between the T-S Dis. and barium deficiency was confirmed from an expended experiment.