Partial　evaluation　is　an　automatic　approach　to　customize　a　program　with　respect　to　configuration　values　and　invariants　of　the　program　itself.　XQuery　is　a　new　query　language　for　querying　XML　data　source.　In　this　paper,　we　present　a　partial　evaluation　system　for　the　XQuery　language　named　XQPE.　XQPE　is　an　off-line　partial　evaluation　system;　it　offers　specialization　at　compile　time,　and　program　specialization.　The　partial　evaluation　process　of　XQPE　can　be　divided　into　two　phases:　one　is　analysis　phase,　and　the　other　is　specialization　phase.　Our　XQPE　has　been　implemented　in　Java,　and　the　results　of　experiments　show　that　the　speedups　of　XQuery　residual　programs　we　have　obtained　are　good.　©　2008　IEEE.