回复：请教专业人士：申请哥哥（在中国）移民排期问题：

不是专业人士， 请参考this link Q and A:
http://guangzhou.usembassy-china.org.cn/iv_faq.html

Frequently Asked Questions:
Question: I'm not ready to travel, can I postpone my visa application?

Answer: Yes, but stay in touch by writing at least once per year and let us know three months before you are ready.