8老师你好!我的H1b有效期从2015年9月到2018年9月，h1b visa已经过期，现在有回美证，有效期到2017年10月。现在公司想派我到中国工作4个月。请问需要什么手续？
-No. It is like your regular visiting China.
需要出份文件说明外派我到中国工作么？
-No, but you need to have the employment verification letter from your employer if you want to apply for H-1 visa to come back.
我还需要在中国申请h1b visa然后入境么？还是4个月后拿回美证回来就可以了？
-Either one is OK, but it is better to apply for H-1 visa to come back. The company should reimburse the visa application fee for you in your case. So, just talk to the employer about the cost for visa application.
现在有些担心出境太久入境有麻烦。恳请8老师解答。
