The　ordered　regular　tree　pattern　can　be　used　for　processing　complex　events　on　XML　stream　data.　It　not　only　can　constrain　the　structural　relationships　among　events,　but　also　can　constrain　sequential　constraint.　The　ordered　regular　tree　pattern　has　strong　descriptive　ability　for　complex　events.　In　order　to　further　improve　the　query　processing　efficiency　of　the　ordered　regular　tree　model,　this　paper　presents　a　method　to　optimize　the　ordered　normal　tree　using　the　semantic　information　and　structure　information　of　DTD.　Experimental　results　show　that　this　optimization　method　can　effectively　improve　the　execution　efficiency　of　the　ordered　regular　tree　pattern.