在绿卡到期6个月之前开始着手更新。 填写表格USCIS I-90。 需要一并递交的证明文件或副本：

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It is hard to gauge how timely the renewal process is. Once in a while, the process backs up and it takes months and months. This isn't often, but it's best to take precaution. You may also want to renew your green card if it's been lost or stolen (if stolen, contact the emergency department), damaged, your information has changed, you have turned 14, or you have taken up commuter status. This form is available at the United States Citizenship and Immigration services website. Or, alternatively, you can file it on paper. The USCIS requires the form to be filled in completely. Processing will not begin until this is done.  The I-90 form can either be filed electronically (the fee may be paid simultaneously) or you can use the U.S. Postal Service. If you would like to receive one by mail, call the form orders line at 1-800-870-3676. Make sure you have a picture of the expiring green card that you can upload to the online application or have a printed copy of the expiring green card for the mail-in application. You may or may not be eligible to e-file. Check their website for more information. Currently, that fee is $540.00 and is subject to change. It includes an $85 fee for biometrics -- fancy talk for taking your fingerprints, taking your photo, and the electronically capturing your signature. This should be done online with your e-filing or included with your form when mailed in. They accept American Express, Mastercard, Visa, and Discover cards.  If you are filing on paper, send in your application and fee to the following address:  USCISAttention: I-90PO BOX 21262Phoenix, AZ 85036  Pay the fee with a personal or cashier's check or money order drawn on a U.S. bank payable in U.S. dollars to the U.S. Department of Homeland Security. Do not use the initials DHS or USDHS or USCIS when writing checks. Do not send cash or traveler's checks.   Once payment is received, you will receive a receipt. On this receipt will be the address to which you send the supporting documents. Additionally, if biometrics services...