f签证什么意思？
F-1学生(For Academic Studies)，是指以学习为目的入境美国的留学生，需要申请I-20表，携带此表格入境美国后去学校报到注册。持F-1签证入境的美国是免签的，中国不是它的免签国。 持有F-1签证的人如果回国再返回美国的，属于返回原来签证签发地的范畴.
F-1留学生的家属可申请何种签证？ F-1学生的配偶和未满21岁的未婚子女可获发F-3或F-4非移民签证。 F-3身份可从事任何合法工作；而F-4只允许在校内工作。 在美国，没有绿卡（即永久居民）的身份，但持有有效的学生和交流访问学者项目(Student and Exchange Visitor Program，SEVP)身份的人士在美国境内享有一定的特权。他们可以在学习期间在美国居留长达五年之久，并可多次出入境。不过要连续合法留美，必须遵守相关的法律规定。 SEVIS费用为$205美元，必须在赴美前缴清才可获发I-20表。
如何申请F-1签证 申请人应首先向所在国家的美国大使馆或领事馆索取申请表格及注意事项。所有材料均应如实填报，并需交验有效的护照和其他证件原件。申请表应如实填写，不得有虚假、捏造的内容。
申请材料包括： (1) I-20 Form; (2) Passport with at least six months validity remaining，and two passport sized photos; (3) Acceptance Letter by the School of Record， if applicable; (4) Proof that a student has sufficient financial support to cover study/research period in U.S. A bank statement showing a minimum balance of $10，000 is adequate proof for students who have been accepted into an institution which provides academic or exchange training program but does not provide such funding directly．If you are applying from outside the United States，it may take up to three weeks before your account will have funds available as it can vary depending on where your money originates．The amount should be maintained until after you finish your studies， graduate school programs， or exchange visit even if later than one year beyond expiry date of visa； (5) Evidence proving that the sponsor has had the necessary income and assets to fulfill his commitments over the last two years； (6) Birth certificate copy with translated version， Marriage Licence Certificate(if relevant); Divorce Decree Document(if relevant); Death Certificate of deceased spouse(if relevant).