留学生每学期注册有硬时限：学校须在开课30天内完成SEVIS注册、信息变更21天内更新
美国国土安全部 Study in the States 在开学准备提醒中列明学校指定校方代表（DSO）的时限义务：每学期开课后，学校须在30天内为学生完成学生与交流访问者信息系统（SEVIS）注册，并确认学生修满全程课业、联系信息与关键日期都是最新状态。
学年进行中，学生的联系方式、课程安排或课程结束日期一有变化，DSO 须在21天内更新 SEVIS 记录；课程结束日期需要提前或延后的，学校要据此签发更新后的 I-20 表格。学生一侧的配合动作包括：抵美后主动联系 DSO、联系方式（邮箱、电话、住址）一变就报告、退课或减课前先征得 DSO 同意、出境旅行前两到四周申请旅行签名。
这组时限与2026年9月15日生效的学生固定停留期限新规同属本学年的合规框架。学生发现记录有误或怀疑文件造假，应立即联系 DSO 或 SEVP 响应中心处理。（来源：美国国土安全部 Study in the States）
Hard Deadlines for Student Registration: Schools Must Complete SEVIS Registration Within 30 Days of Term Start and Update Changes Within 21 Days
In its back-to-school guidance, Study in the States sets out the deadline duties of designated school officials (DSOs): at the start of each term, schools must complete registration in the Student and Exchange Visitor Information System (SEVIS) no later than 30 days after the session begins, confirming that students are enrolled in a full course of study and that contact details and key dates are current.
During the year, whenever a student's information changes, DSOs must update SEVIS records within 21 days, and where a program end date needs to be shortened or extended, the school issues an updated Form I-20. Students do their part by checking in with the DSO after arrival, reporting any change of email, phone, or address right away, getting DSO approval before dropping below a full course load, and requesting travel signatures two to four weeks before a trip abroad.
These deadlines sit alongside the fixed period of admission rule that took effect on September 15, 2026. Students who spot an error in their record, or suspect document fraud, should contact their DSO or the SEVP Response Center promptly. (Source: Study in the States, U.S. Department of Homeland Security)
来源：美国国土安全部 Study in the States
发布：GSM·美国（发布链接）
图片来源：图片来源：Wikimedia Commons「Sias Library - Students Studying 2017」（Gary Todd 摄，CC0），图中为图书馆里学习的学生 Image: Wikimedia Commons "Sias Library - Students Studying 2017" (by Gary Todd, CC0)
GSM Global · 本篇英文版 English edition of this story
