回複：回複：回複：我最關心的是第一個問題，如果每5個月回美國一次，是不是能keep自己的連續居住時間的記錄。

You got it right.
When you file for n-400, you will need to fill in white and black how many days have you been outside US and for what purpose, along with n-400 you are required to send in 3 or 5 years of tax transcript.  Your plan doesnt' sound very promising if you want to claim your citizenship in a couple of years while you are away.