diff --git a/public/static/js/phone-image.js b/public/static/js/phone-image.js
index c0c7c83..acfde91 100644
--- a/public/static/js/phone-image.js
+++ b/public/static/js/phone-image.js
@@ -1573,7 +1573,10 @@ var PhoneImageEngine = (function () {
             var $phonePage = $containers.eq(pageIndex).find('.phone-image-page');
             if ($phonePage.length) {
                 $phonePage.removeClass('valign-top valign-center valign-bottom');
-                var alignment = (config.pageAlignments && config.pageAlignments[pageIndex + 1]) || 'top';
+                // 从DOM中获取正确的pageNum（与setPageAlignment使用的key一致）
+                var $select = $('.thumb-alignment-select[data-page-index="' + pageIndex + '"]');
+                var pageNum = $select.length ? parseInt($select.attr('data-page-num'), 10) : (pageIndex + 1);
+                var alignment = (config.pageAlignments && config.pageAlignments[pageNum]) || 'top';
                 $phonePage.addClass('valign-' + alignment);
             }
         }