多謝，我的priority date還有很久呢，如果h1b延了3年以後我再跳，新雇主給我辦h1b transfer,
如果我到了新雇主之後舊雇主撤案，會影響新h1b的有效性麽？
-No. The h1 is fine.
如果新雇主重新申請綠卡，是不是隻有舊雇主不撤案的情況下我才可以用原來的priority date?
-I think you can still use the PD even if your old I-140 is withdrawn. But some people have different opinion.
Here is one artclce with different opinion:
http://www.fanuslaw.com/article_details.php?aid=6974
Anyway, it may be decided by individual officer who is in charge of your case.
