大陸車牌轉香港牌..

可以，只要能夠提供在大陸的居住證明，例如工作或求學證明，或暫住證都可以。
http://www.td.gov.hk/filemanager/common/tdforms/td63a(2009.11).pdf
(d) 你符合以下三項申請資格的其中一項：
you satisfy one of the three requirements below:
(i) 該執照原本是你在發出該執照的國家或地方居留不少於6 個月的期間發出的(證明文件包括有關護照以顯示出入境記錄或官方簽發的出入境證
明，以及你在當地學校的成績，或受聘公司發給的聘用期間證明文件等)；或
the licence was originally issued to you on any date during a period of residence of not less than 6 months in the country or place of issue (supporting
documents include the relevant passport showing records of entry and departure or an official statement of travel records, and your school transcript
or employer’s testimonial with employment period specified, etc.); or
(ii) 緊接本申請表呈交日期之前，該執照已簽發給你不少於五年；或
the licence has been issued to you for not less than 5 years immediately prior to the application; or
(iii) 你持有發出該執照的國家或地方所發的護照或同等旅行證件。
you hold a passport or an equivalent travel document issued in the country or place in which your licence was issued.

粵港兩地換車牌計劃，只是互惠於對方居民，即你是港人而用大陸牌想換香港牌是不可以的，只有大陸居民持大陸牌才可以換香港牌。

如果你是香港永久居民的話是不能轉換的，轉換是給內地人的，希望幫到你