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H-1B签证期限

H- 1B持证者每次可申请延期停留3年，在美最长停留为6年期限，期满后持证人必须回国一年，才能再次申请同类（H）签证来美。H-1B之延期应在美国停留期 限到期之前至少45天，由美国雇主为其填妥“非移民雇员申请表”（I-129）及H类补充表格，附上原签证移民局批准书（I-797表）、I-94入境卡 原件、说明延期理由的雇主信函和相关的辅助文件等，一起向就近的美国移民局提出申请。眷属H-4签证之停留延期应填写I-539延期申请表。如果I- 129或I-539延期批准后，其I-797表格和I-94卡上会有新签发的停留期限，申请人可持批准后的I-797表再向国务院签证办公室提出签证加签 的申请或向海外美国领事馆提出签证延期的申请。
H-1B身份入境后，不可以转换雇主，必须到为申请人担保的美国雇主公司工作。在美期间如申请人要转换新的工作，必须由新雇主为其向移民局提出新的申请，包括重新向劳工部申报“劳工情况申请表”，获得移民局批准才能保持申请人在美国的合法身份。
申请人以H-1B非移民身份在美国临时性，如要调整为职业移民身份，首先要由雇主向劳工部为其申请永久性劳工证“外 国人工作证明”（ETA-750 Alien Employment Certification）。在获得永久性劳工证后，雇主才能向移民局提出“职业移民”（I-140 Immigrant Petition for Alien Worker）申请。获准职业移民申请后，申请人即可申请调整身份（I485 Application to Register Permanent Residence or Adjust Status）。
持证人如以其他类非移民签证身份合法进入美国，需要转换成H-1B签证身份，申请人首要条件是在美国没有非法工作记录，在I-94出入境记录卡上没有失效前，被美国雇主所聘用。申请人转换身份的申请与非移民雇员的申请，应由美国雇主一并向移民局提出。
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