According to the official website of Sanya Phoenix International Airport, you can only enter the fast security line with your carry-on luggage after it has been screened separately at a designated area. This is because the fast security lane is designed for passengers who have already passed through initial screening and are entering the secured area.
To speed up the process, airports often recommend that you send your checked luggage to the baggage claim first before heading to the fast security line with only your carry-on items.