Thank you, I found the answer

來源: EagleUWM 於 2005-09-29 14:16:03 [] [舊帖] [給我悄悄話] 閱讀數 : (282 bytes)

with website: http://www.immihelp.com/visas/i539.html

A#: A# number stands for eight-digit alien number. You will have A# number only if you filed certain immigration petitions such as I-485, EAD etc. Visitors don't have A# number and you can write 'None' in this field.

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