多谢，我的priority date还有很久呢，如果h1b延了3年以后我再跳，新雇主给我办h1b transfer,
如果我到了新雇主之后旧雇主撤案，会影响新h1b的有效性么？
-No. The h1 is fine.
如果新雇主重新申请绿卡，是不是只有旧雇主不撤案的情况下我才可以用原来的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-I think you can still use the PD even if your old I-140 is withdrawn.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.
