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我们在申请美国签证或者绿卡的时候，会收到美国移民局的notice of action i-797。
图片来自网络
I-797通知种类和介绍可以看看美国移民局官方网址：
本文章根据看看美国移民局官方的介绍翻译成中文的。
Form I-797: Types and FunctionsSCIS uses numerous types of Form I-797 to communicate with applicants/petitioners or convey an immigration benefit. Form I-797 is NOT a form you can fill out.
The chart below gives a brief description of each:
Form NumberDescriptionI-797Notice of Action Issued to communicate receipt or approval an application or petition.I-797AIssued to an applicant as a replacement Form I-94.I-797BIssued for approval of an alien worker petition.I-797CIssued to communicate receipt or rejection of an applications or petitions; transfer of files; fingerprint biometric, interview and re-scheduled appointments; and re-opening of cases.I-797DAccompanies benefit cards.I-797EIssued to request evidence.I-797FIssued overseas to allow applicants to travel.I-797通知种类和介绍
通知类型通知介绍I-797申请被批准的通知I-797A作为 I-94入境/离境记录的代替I-797B外籍员工申请被批准I-797C用途最多的最常用被使用的通知类型：申请接受通知拒收通知案件转移通知预约通知重新审理通知I-797D给申请人发福利卡，比如绿卡、工卡、回美证等时候伴随的通知申请接受通知拒收通知案件转移通知预约通知重新审理通知I-797E要求补充材料的通知I-797F允许海外申请人前往美国的通知，通常给绿卡遗失、损毁、残缺或者过期的永久居民。以上内容如有错误，请以美国移民局官方网址的内容为准。
Tips:在整个签证或者绿卡申请过程中，一定要保存好各种材料和通知，最好把材料的电子版存在安全的网盘上，或者邮箱里面，尤其是重要的几个号码，比如case number，alien registration number，GUZ码，CGI码等等。重要的文件也最好在邮箱或者网盘里备份一下。