回複：H1b renew 需要離境連續的12個月嗎？還是累計的12個月？

It can be  累計的12個月 with short break. See some information at these links:
http://www.avvo.com/legal-answers/regarding-1-year-gap-outside-us-after-6-years-on-h-154114.html
http://www.avvo.com/legal-answers/can-there-be-a-break-in-1-year-period--out-of-us---1166987.html
http://www.avvo.com/legal-answers/one-year-h1-b-l1-clock-reset-period-after-6-years--1653052.html